Bonjour,

peut être installer les pilotes proprio nvidia, pour de l'OpenGL ça ira bien mieux normalement.
Merci pour ta suggestion, mais pour l'instant je souhaite conserver les pilotes libres.

J'ai fais quelques recherches ce matin.

Déja en ce connectant directement sur le poste en F18. Nous avons : 
# LIBGL_DEBUG=verbose openscad
libGL: OpenDriver: trying /usr/lib/dri/nouveau_vieux_dri.so
$ LIBGL_DEBUG=verbose openscad
libGL: OpenDriver: trying /usr/lib/dri/nouveau_vieux_dri.so
Dans "dmesg | grep dri", j'ai remarqué cela :
[    3.214267] fb: conflicting fb hw usage nouveaufb vs VESA VGA - removing generic driver
[    3.329069] [drm] No driver support for vblank timestamp query.
Et "dmesg | grep drm" me donne cela :
[    3.018264] [drm] Initialized drm 1.1.0 20060810
[    3.329061] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    3.329069] [drm] No driver support for vblank timestamp query.
[    3.470856] drm: registered panic notifier
[    3.470867] [drm] Initialized nouveau 1.1.0 20120801 for 0000:01:00.0 on minor 0
Et la je ne sais pas interpreter les messages.

Puis 
# grep -i dri2 /var/log/Xorg.0.log
[    24.651] Initializing built-in extension DRI2
[    25.245] (II) NOUVEAU(0): [DRI2] Setup complete
[    25.245] (II) NOUVEAU(0): [DRI2]   DRI driver: nouveau_vieux
[    25.245] (II) NOUVEAU(0): [DRI2]   VDPAU driver: nouveau_vieux
[    25.481] (II) GLX: Initialized DRI2 GL provider for screen 0
J'ai les questions suivantes

- Pourqui sur le serveur on cherche "nouveau_vieux_dri.so" alors qu'avec le client on cherche "nouveau_dri.so" ?

- Pour resoudre le "libGL error: failed to open drm device: Permission non accordée", jai ajouté sur le serveur le fichier xorg.conf avec uniquement les lignes suivantes : 
Section "DRI"
    Mode 0666
EndSection
Est-ce la bonne pratique alors qu'il existe des repertoires xorg.conf.d ?

- Si j'ai bien compris le "libGL error: failed to authenticate magic" est un problème d'authentification Xauthority. Cela devrai etre tansparent avec ssh -X et dans le sshd_config j'ai bien "X11Forwarding yes". Pouvez-vous m'éclairer sur ce point ?

Merci de votre aide.
Juste sur la section DRI, tu peux mettre ça dans le xorg.conf ou dans un fichier dans le xorg.conf.d ça revient au même. A toi de voir en fonction de tes préférences. Pour le reste aucune idée.
Ok pour le xorg.conf et xorg.conf.d.

Pour le reste, il faut que je prenne le temps de faire l'inverse (Affichage depuis F16 sur F18) pour voir.

A suivre
Bon je viens de faire le test d'affichage de F16 vers F18 et j'obtiens cela :

avec un ssh -X 
Last login: Mon Feb  4 08:26:02 2013
/usr/bin/xauth:  /home/laurent/.Xauthority not writable, changes will be ignored
et ensuite 
$ /usr/bin/glxgears
X11 connection rejected because of wrong authentication.
X11 connection rejected because of wrong authentication.
X11 connection rejected because of wrong authentication.
X11 connection rejected because of wrong authentication.
Error: couldn't open display localhost:10.0
Si vous avez des piste, je suis à votre écoute.

Bonne journée à tous
/usr/bin/xauth:  /home/laurent/.Xauthority not writable, changes will be ignored
Et bien ton fichier /home/laurent/.Xauthority n'a pas les bons droits, du coup ssh ne peut ecrire dedans, le forward x11 n'est donc pas possible, d'où les erreur d'authentification X11 (le fichier .Xauthority sert pour stocker une sorte de cookie d'authentification).
Oups, c'est pas suffisant.

J'ai un peu regardé ailleurs sur ce problème. Il est conseillé de supprimer le /home/laurent/.Xauthority. Je l'ai seulement renommé c'est plus reversible à mon goût.

L'experience donne la chose suivante :
A la premiere reconnexion , j'ai eu un message m'indiquant que le /home/laurent/.Xauthority n'existe pas. Normal

Aprés, j'ai :
$ /usr/bin/glxgears
16 frames in 5.3 seconds =  2.999 FPS
14 frames in 5.3 seconds =  2.633 FPS
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server "localhost:10.0"
      after 134 requests (134 known processed) with 0 events remaining.
J'ai peut me connecter mais c'est toujours pas utilisable.

Dans l'autre sens, j'ai toujours :
$ LIBGL_DEBUG=verbose /usr/bin/glxgears
libGL: OpenDriver: trying /usr/lib/dri/nouveau_dri.so
libGL error: failed to authenticate magic 3
libGL error: failed to load driver: nouveau
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
7 frames in 5.2 seconds =  1.358 FPS
15 frames in 5.3 seconds =  2.838 FPS
19 frames in 5.2 seconds =  3.645 FPS
18 frames in 5.2 seconds =  3.460 FPS
18 frames in 5.3 seconds =  3.413 FPS
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server "localhost:10.0"
      after 288 requests (288 known processed) with 0 events remaining.

Bon, c'est pas cool ce truc.
OpenGL vendor string: VMware, Inc.
C'est quoi ça?
Bonne question, sur le portable F16 j'ai
 $  glxinfo | grep OpenGL\ vendor\ string
OpenGL vendor string: nouveau
Serai-ce une nouvelle piste ?

Sous F16
$ rpm -qa | grep vmware | sort
xorg-x11-drv-vmware-11.0.3-6.fc16.x86_64
et
$ /sbin/lsmod | grep nouveau
nouveau               907023  2 
ttm                    79619  1 nouveau
drm_kms_helper         40132  1 nouveau
drm                   255124  4 nouveau,ttm,drm_kms_helper
i2c_algo_bit           13251  1 nouveau
i2c_core               38317  5 videodev,nouveau,drm_kms_helper,drm,i2c_algo_bit
mxm_wmi                12866  1 nouveau
video                  18988  1 nouveau
wmi                    18698  2 nouveau,mxm_wmi
Sous F18
$ rpm -qa | grep vmware | sort
xorg-x11-drv-vmware-12.0.2-3.20120718gite5ac80d8f.fc18.i686
et
$ lsmod | grep nouveau
nouveau               821709  2 
mxm_wmi                12762  1 nouveau
wmi                    18274  2 mxm_wmi,nouveau
video                  18552  1 nouveau
i2c_algo_bit           13066  1 nouveau
drm_kms_helper         43551  1 nouveau
ttm                    68217  1 nouveau
drm                   216715  4 ttm,drm_kms_helper,nouveau
i2c_core               28450  5 drm,i2c_i801,drm_kms_helper,i2c_algo_bit,nouveau

Est-ce bien cohérent ?
ça à l'air cohérent, c'est ton glxinfo qui est peut être pas normal. Que donne 
glxinfo|head
Et si tu peux nous donner le contenu de tes fichiers /var/log/Xorg.0.log
Et hop 
$ glxinfo|head
libGL error: failed to load driver: nouveau
libGL error: Try again with LIBGL_DEBUG=verbose for more details.
name of display: localhost:10.0
display: localhost:10  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_INTEL_swap_event, 
    GLX_MESA_copy_sub_buffer, GLX_OML_swap_method, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
et puis :
$ more  /var/log/Xorg.0.log
[    49.769] 
X.Org X Server 1.13.2
Release Date: 2013-01-24
[    49.769] X Protocol Version 11, Revision 0
[    49.769] Build Operating System:  2.6.32-279.19.1.el6.x86_64 
[    49.769] Current Operating System: Linux localhost.localdomain 3.7.4-204.fc18.i686.PAE #1 SMP Wed Jan 23 16:58:41 UTC 2013 i686
[    49.770] Kernel command line: BOOT_IMAGE=/vmlinuz-3.7.4-204.fc18.i686.PAE root=UUID=60a65c44-f5fb-40fa-a732-946338000035 ro rd.md=0 rd.lvm=0 rd.dm=0 vconsole.
keymap=fr rd.luks=0 rhgb quiet LANG=fr_FR.UTF-8
[    49.770] Build Date: 25 January 2013  11:43:07PM
[    49.770] Build ID: xorg-x11-server 1.13.2-1.fc18 
[    49.770] Current version of pixman: 0.26.2
[    49.770]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[    49.770] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    49.771] (==) Log file: "/var/log/Xorg.0.log", Time: Mon Feb  4 19:47:08 2013
[    49.801] (==) Using config file: "/etc/X11/xorg.conf"
[    49.801] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    49.801] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    49.920] (==) No Layout section.  Using the first Screen section.
[    49.920] (==) No screen section available. Using defaults.
[    49.920] (**) |-->Screen "Default Screen Section" (0)
[    49.920] (**) |   |-->Monitor "<default monitor>"
[    49.955] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[    49.955] (==) Automatically adding devices
[    49.955] (==) Automatically enabling devices
[    49.955] (==) Automatically adding GPU devices
[    49.955] (==) FontPath set to:
        catalogue:/etc/X11/fontpath.d,
        built-ins
[    49.955] (==) ModulePath set to "/usr/lib/xorg/modules"
[    49.955] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[    49.955] (II) Loader magic: 0x8263680
[    49.955] (II) Module ABI versions:
[    49.955]    X.Org ANSI C Emulation: 0.4
[    49.955]    X.Org Video Driver: 13.1
[    49.955]    X.Org XInput driver : 18.0
[    49.956]    X.Org Server Extension : 7.0
[    49.957] (II) config/udev: Adding drm device (/dev/dri/card0)
[    49.964] (--) PCI:*(0:1:0:0) 10de:0171:1462:8743 rev 163, Mem @ 0xfd000000/16777216, 0xe8000000/134217728, 0xf7e80000/524288, BIOS @ 0x????????/131072
[    49.986] Initializing built-in extension Generic Event Extension
[    49.986] Initializing built-in extension SHAPE
[    49.987] Initializing built-in extension MIT-SHM
[    49.987] Initializing built-in extension XInputExtension
[    49.987] Initializing built-in extension XTEST
[    49.987] Initializing built-in extension BIG-REQUESTS
[    49.987] Initializing built-in extension SYNC
[    49.987] Initializing built-in extension XKEYBOARD
[    49.988] Initializing built-in extension XC-MISC
[    49.988] Initializing built-in extension XINERAMA
[    49.988] Initializing built-in extension XFIXES
[    49.988] Initializing built-in extension RENDER
[    49.988] Initializing built-in extension RANDR
[    49.988] Initializing built-in extension COMPOSITE
[    49.988] Initializing built-in extension DAMAGE
[    49.988] Initializing built-in extension MIT-SCREEN-SAVER
[    49.988] Initializing built-in extension DOUBLE-BUFFER
[    49.988] Initializing built-in extension RECORD
[    49.988] Initializing built-in extension DPMS
[    49.988] Initializing built-in extension X-Resource
[    49.988] Initializing built-in extension XVideo
[    49.988] Initializing built-in extension XVideo-MotionCompensation
[    49.988] Initializing built-in extension SELinux
[    49.988] Initializing built-in extension XFree86-VidModeExtension
[    49.988] Initializing built-in extension XFree86-DGA
[    49.988] Initializing built-in extension XFree86-DRI
[    49.988] Initializing built-in extension DRI2
[    49.988] (II) LoadModule: "glx"
[    50.006] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    50.053] (II) Module glx: vendor="X.Org Foundation"
[    50.054]    compiled for 1.13.2, module version = 1.0.0
[    50.054]    ABI class: X.Org Server Extension, version 7.0
[    50.054] (==) AIGLX enabled
[    50.072] Loading extension GLX
[    50.074] (==) Matched nouveau as autoconfigured driver 0
[    50.074] (==) Matched nv as autoconfigured driver 1
[    50.074] (==) Matched nouveau as autoconfigured driver 2
[    50.074] (==) Matched nv as autoconfigured driver 3
[    50.074] (==) Matched vesa as autoconfigured driver 4
[    50.074] (==) Matched modesetting as autoconfigured driver 5
[    50.074] (==) Matched fbdev as autoconfigured driver 6
[    50.074] (==) Assigned the driver to the xf86ConfigLayout
[    50.074] (II) LoadModule: "nouveau"
[    50.076] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[    50.193] (II) Module nouveau: vendor="X.Org Foundation"
[    50.195]    compiled for 1.13.0, module version = 1.0.6
[    50.195]    Module class: X.Org Video Driver
[    50.195]    ABI class: X.Org Video Driver, version 13.0
[    50.195] (II) LoadModule: "nv"
[    50.207] (WW) Warning, couldn't open module nv
[    50.207] (II) UnloadModule: "nv"
[    50.207] (II) Unloading nv
[    50.207] (EE) Failed to load module "nv" (module does not exist, 0)
[    50.207] (II) LoadModule: "vesa"
[    50.207] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    50.220] (II) Module vesa: vendor="X.Org Foundation"
[    50.220]    compiled for 1.12.99.902, module version = 2.3.2
[    50.220]    Module class: X.Org Video Driver
[    50.220]    ABI class: X.Org Video Driver, version 13.0
[    50.220] (II) LoadModule: "modesetting"
[    50.221] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    50.242] (II) Module modesetting: vendor="X.Org Foundation"
[    50.242]    compiled for 1.13.0, module version = 0.6.0
[    50.242]    Module class: X.Org Video Driver
[    50.242]    ABI class: X.Org Video Driver, version 13.0
[    50.242] (II) LoadModule: "fbdev"
[    50.243] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[    50.259] (II) Module fbdev: vendor="X.Org Foundation"
[    50.259]    compiled for 1.12.99.902, module version = 0.4.3
[    50.259]    Module class: X.Org Video Driver
[    50.259]    ABI class: X.Org Video Driver, version 13.0
[    50.259] (II) NOUVEAU driver 
[    50.259] (II) NOUVEAU driver for NVIDIA chipset families :
[    50.259]    RIVA TNT        (NV04)
[    50.259]    RIVA TNT2       (NV05)
[    50.259]    GeForce 256     (NV10)
[    50.260]    GeForce 2       (NV11, NV15)
[    50.260]    GeForce 4MX     (NV17, NV18)
[    50.260]    GeForce 3       (NV20)
[    50.260]    GeForce 4Ti     (NV25, NV28)
[    50.260]    GeForce FX      (NV3x)
[    50.260]    GeForce 6       (NV4x)
[    50.260]    GeForce 7       (G7x)
[    50.261]    GeForce 8       (G8x)
[    50.261]    GeForce GTX 200 (NVA0)
[    50.261]    GeForce GTX 400 (NVC0)
[    50.261] (II) VESA: driver for VESA chipsets: vesa
[    50.261] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    50.261] (II) FBDEV: driver for framebuffer: fbdev
[    50.261] (++) using VT number 1

[    50.305] (II) [drm] nouveau interface version: 1.1.0
[    50.305] (WW) Falling back to old probe method for vesa
[    50.305] (WW) Falling back to old probe method for modesetting
[    50.306] (WW) Falling back to old probe method for fbdev
[    50.306] (II) Loading sub module "fbdevhw"
[    50.306] (II) LoadModule: "fbdevhw"
[    50.306] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    50.331] (II) Module fbdevhw: vendor="X.Org Foundation"
[    50.331]    compiled for 1.13.2, module version = 0.0.2
[    50.331]    ABI class: X.Org Video Driver, version 13.1
[    50.331] (II) Loading sub module "dri"
[    50.333] (II) LoadModule: "dri"
[    50.333] (II) Module "dri" already built-in
[    50.333] (II) NOUVEAU(0): Loaded DRI module
[    50.333] (--) NOUVEAU(0): Chipset: "NVIDIA NV17"
[    50.333] (II) NOUVEAU(0): Creating default Display subsection in Screen section
        "Default Screen Section" for depth/fbbpp 24/32
[    50.333] (==) NOUVEAU(0): Depth 24, (--) framebuffer bpp 32
[    50.333] (==) NOUVEAU(0): RGB weight 888
[    50.335] (==) NOUVEAU(0): Default visual is TrueColor
[    50.335] (==) NOUVEAU(0): Using HW cursor
[    50.335] (==) NOUVEAU(0): GLX sync to VBlank disabled.
[    50.335] (==) NOUVEAU(0): Page flipping enabled
[    50.335] (==) NOUVEAU(0): Swap limit set to 2 [Max allowed 2]
[    50.393] (II) NOUVEAU(0): Output VGA-1 has no monitor section
[    50.420] (II) NOUVEAU(0): Output TV-1 has no monitor section
[    50.454] (II) NOUVEAU(0): EDID for output VGA-1
[    50.454] (II) NOUVEAU(0): Manufacturer: API  Model: 9808  Serial#: 25020
[    50.454] (II) NOUVEAU(0): Year: 2000  Week: 30
[    50.454] (II) NOUVEAU(0): EDID Version: 1.2
[    50.454] (II) NOUVEAU(0): Analog Display Input,  Input Voltage Level: 0.700/0.300 V
[    50.454] (II) NOUVEAU(0): Sync:  Separate  Composite
[    50.454] (II) NOUVEAU(0): Max Image Size [cm]: horiz.: 31  vert.: 23
[    50.455] (II) NOUVEAU(0): Gamma: 2.65
[    50.455] (II) NOUVEAU(0): DPMS capabilities: StandBy Suspend Off; RGB/Color Display
[    50.455] (II) NOUVEAU(0): First detailed timing is preferred mode
[    50.455] (II) NOUVEAU(0): redX: 0.632 redY: 0.335   greenX: 0.295 greenY: 0.593
[    50.455] (II) NOUVEAU(0): blueX: 0.143 blueY: 0.065   whiteX: 0.280 whiteY: 0.311
[    50.455] (II) NOUVEAU(0): Supported established timings:
[    50.455] (II) NOUVEAU(0): 720x400@70Hz
[    50.455] (II) NOUVEAU(0): 640x480@60Hz
[    50.455] (II) NOUVEAU(0): 640x480@72Hz
[    50.455] (II) NOUVEAU(0): 640x480@75Hz
[    50.455] (II) NOUVEAU(0): 800x600@56Hz
[    50.455] (II) NOUVEAU(0): 800x600@60Hz
[    50.455] (II) NOUVEAU(0): 800x600@72Hz
[    50.455] (II) NOUVEAU(0): 800x600@75Hz
[    50.455] (II) NOUVEAU(0): 1024x768@60Hz
[    50.455] (II) NOUVEAU(0): 1024x768@70Hz
[    50.455] (II) NOUVEAU(0): 1024x768@75Hz
[    50.455] (II) NOUVEAU(0): Manufacturer's mask: 0
[    50.455] (II) NOUVEAU(0): Supported standard timings:
[    50.455] (II) NOUVEAU(0): #0: hsize: 800  vsize 600  refresh: 85  vid: 22853
[    50.455] (II) NOUVEAU(0): #1: hsize: 1024  vsize 768  refresh: 85  vid: 22881
[    50.455] (II) NOUVEAU(0): #2: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
[    50.455] (II) NOUVEAU(0): Supported detailed timing:
[    50.455] (II) NOUVEAU(0): clock: 94.5 MHz   Image Size:  310 x 230 mm
[    50.455] (II) NOUVEAU(0): h_active: 1024  h_sync: 1072  h_sync_end 1168 h_blank_end 1376 h_border: 0
[    50.455] (II) NOUVEAU(0): v_active: 768  v_sync: 769  v_sync_end 772 v_blanking: 808 v_border: 0
[    50.463] (II) NOUVEAU(0): Monitor name: Acer 77e
[    50.463] (II) NOUVEAU(0): Serial No: 25020
[    50.463] (II) NOUVEAU(0): Ranges: V min: 50 V max: 120 Hz, H min: 30 H max: 72 kHz, PixClock max 115 MHz
[    50.463] (II) NOUVEAU(0): EDID (in hex):
[    50.463] (II) NOUVEAU(0):   00ffffffffffff0006090898bc610000
[    50.463] (II) NOUVEAU(0):   1e0a01020c1f17a5eafbbea1554b9724
[    50.463] (II) NOUVEAU(0):   10474fafce0045596159818001010101
[    50.463] (II) NOUVEAU(0):   010101010101ea240060410028303060
[    50.463] (II) NOUVEAU(0):   130036e610000000000000fc00416365
[    50.463] (II) NOUVEAU(0):   72203737650a20202020000000ff0032
[    50.463] (II) NOUVEAU(0):   353032300a20202020202020000000fd
[    50.463] (II) NOUVEAU(0):   0032781e480b000a2020202020200075
[    50.463] (II) NOUVEAU(0): Printing probed modes for output VGA-1
[    50.463] (II) NOUVEAU(0): Modeline "1024x768"x85.0   94.50  1024 1072 1168 1376  768 769 772 808 -hsync -vsync (68.7 kHz eP)
[    50.463] (II) NOUVEAU(0): Modeline "1280x1024"x60.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[    50.463] (II) NOUVEAU(0): Modeline "1280x960"x60.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
[    50.463] (II) NOUVEAU(0): Modeline "1280x800"x74.9  106.50  1280 1360 1488 1696  800 803 809 838 -hsync +vsync (62.8 kHz e)
[    50.463] (II) NOUVEAU(0): Modeline "1280x800"x59.8   83.50  1280 1352 1480 1680  800 803 809 831 +hsync -vsync (49.7 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1152x864"x75.0  108.00  1152 1216 1344 1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1280x768"x74.9  102.25  1280 1360 1488 1696  768 771 778 805 +hsync -vsync (60.3 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1280x768"x59.9   79.50  1280 1344 1472 1664  768 771 778 798 -hsync +vsync (47.8 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1024x768"x75.1   78.80  1024 1040 1136 1312  768 769 772 800 +hsync +vsync (60.1 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1024x768"x70.1   75.00  1024 1048 1184 1328  768 771 777 806 -hsync -vsync (56.5 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "1024x576"x60.0   46.97  1024 1064 1168 1312  576 577 580 597 -hsync +vsync (35.8 kHz)
[    50.473] (II) NOUVEAU(0): Modeline "800x600"x85.1   56.25  800 832 896 1048  600 601 604 631 +hsync +vsync (53.7 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "800x600"x72.2   50.00  800 856 976 1040  600 637 643 666 +hsync +vsync (48.1 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "800x600"x75.0   49.50  800 816 896 1056  600 601 604 625 +hsync +vsync (46.9 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494 517 +hsync +vsync (31.0 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "640x480"x85.0   36.00  640 696 752 832  480 481 484 509 -hsync -vsync (43.3 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "640x480"x72.8   31.50  640 664 704 832  480 489 491 520 -hsync -vsync (37.9 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "640x480"x75.0   31.50  640 656 720 840  480 481 484 500 -hsync -vsync (37.5 kHz e)
[    50.473] (II) NOUVEAU(0): Modeline "640x480"x60.0   25.20  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz e)
[    50.477] (II) NOUVEAU(0): Modeline "720x400"x85.0   35.50  720 756 828 936  400 401 404 446 -hsync +vsync (37.9 kHz e)
[    50.477] (II) NOUVEAU(0): Modeline "720x400"x70.1   28.32  720 738 846 900  400 412 414 449 -hsync +vsync (31.5 kHz e)
[    50.477] (II) NOUVEAU(0): Modeline "640x400"x85.1   31.50  640 672 736 832  400 401 404 445 -hsync +vsync (37.9 kHz e)
[    50.477] (II) NOUVEAU(0): Modeline "640x350"x85.1   31.50  640 672 736 832  350 382 385 445 +hsync -vsync (37.9 kHz e)
[    50.505] (II) NOUVEAU(0): EDID for output TV-1
[    50.505] (II) NOUVEAU(0): Output VGA-1 connected
[    50.505] (II) NOUVEAU(0): Output TV-1 disconnected
[    50.505] (II) NOUVEAU(0): Using exact sizes for initial modes
[    50.507] (II) NOUVEAU(0): Output VGA-1 using initial mode 1024x768 +0+0
[    50.507] (II) NOUVEAU(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.
[    50.507] (--) NOUVEAU(0): Virtual size is 1024x768 (pitch 0)
[    50.507] (**) NOUVEAU(0):  Driver mode "1024x768": 94.5 MHz (scaled from 0.0 MHz), 68.7 kHz, 85.0 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1024x768"x85.0   94.50  1024 1072 1168 1376  768 769 772 808 -hsync -vsync (68.7 kHz eP)
[    50.507] (**) NOUVEAU(0):  Driver mode "1280x1024": 108.0 MHz (scaled from 0.0 MHz), 64.0 kHz, 60.0 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1280x1024"x60.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[    50.507] (**) NOUVEAU(0):  Driver mode "1280x960": 108.0 MHz (scaled from 0.0 MHz), 60.0 kHz, 60.0 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1280x960"x60.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
[    50.507] (**) NOUVEAU(0):  Driver mode "1280x800": 106.5 MHz (scaled from 0.0 MHz), 62.8 kHz, 74.9 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1280x800"x74.9  106.50  1280 1360 1488 1696  800 803 809 838 -hsync +vsync (62.8 kHz e)
[    50.507] (**) NOUVEAU(0):  Driver mode "1280x800": 83.5 MHz (scaled from 0.0 MHz), 49.7 kHz, 59.8 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1280x800"x59.8   83.50  1280 1352 1480 1680  800 803 809 831 +hsync -vsync (49.7 kHz e)
[    50.507] (**) NOUVEAU(0):  Driver mode "1152x864": 108.0 MHz (scaled from 0.0 MHz), 67.5 kHz, 75.0 Hz
[    50.507] (II) NOUVEAU(0): Modeline "1152x864"x75.0  108.00  1152 1216 1344 1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "1280x768": 102.2 MHz (scaled from 0.0 MHz), 60.3 kHz, 74.9 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1280x768"x74.9  102.25  1280 1360 1488 1696  768 771 778 805 +hsync -vsync (60.3 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "1280x768": 79.5 MHz (scaled from 0.0 MHz), 47.8 kHz, 59.9 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1280x768"x59.9   79.50  1280 1344 1472 1664  768 771 778 798 -hsync +vsync (47.8 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "1024x768": 78.8 MHz (scaled from 0.0 MHz), 60.1 kHz, 75.1 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1024x768"x75.1   78.80  1024 1040 1136 1312  768 769 772 800 +hsync +vsync (60.1 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "1024x768": 75.0 MHz (scaled from 0.0 MHz), 56.5 kHz, 70.1 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1024x768"x70.1   75.00  1024 1048 1184 1328  768 771 777 806 -hsync -vsync (56.5 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "1024x768": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[    50.508] (**) NOUVEAU(0):  Mode "1024x576": 47.0 MHz (scaled from 0.0 MHz), 35.8 kHz, 60.0 Hz
[    50.508] (II) NOUVEAU(0): Modeline "1024x576"x60.0   46.97  1024 1064 1168 1312  576 577 580 597 -hsync +vsync (35.8 kHz)
[    50.508] (**) NOUVEAU(0):  Driver mode "800x600": 56.2 MHz (scaled from 0.0 MHz), 53.7 kHz, 85.1 Hz
[    50.508] (II) NOUVEAU(0): Modeline "800x600"x85.1   56.25  800 832 896 1048  600 601 604 631 +hsync +vsync (53.7 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "800x600": 50.0 MHz (scaled from 0.0 MHz), 48.1 kHz, 72.2 Hz
[    50.508] (II) NOUVEAU(0): Modeline "800x600"x72.2   50.00  800 856 976 1040  600 637 643 666 +hsync +vsync (48.1 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "800x600": 49.5 MHz (scaled from 0.0 MHz), 46.9 kHz, 75.0 Hz
[    50.508] (II) NOUVEAU(0): Modeline "800x600"x75.0   49.50  800 816 896 1056  600 601 604 625 +hsync +vsync (46.9 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "800x600": 40.0 MHz (scaled from 0.0 MHz), 37.9 kHz, 60.3 Hz
[    50.508] (II) NOUVEAU(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
[    50.508] (**) NOUVEAU(0):  Driver mode "800x600": 36.0 MHz (scaled from 0.0 MHz), 35.2 kHz, 56.2 Hz
[    50.510] (II) NOUVEAU(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "848x480": 33.8 MHz (scaled from 0.0 MHz), 31.0 kHz, 60.0 Hz
[    50.510] (II) NOUVEAU(0): Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494 517 +hsync +vsync (31.0 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "640x480": 36.0 MHz (scaled from 0.0 MHz), 43.3 kHz, 85.0 Hz
[    50.510] (II) NOUVEAU(0): Modeline "640x480"x85.0   36.00  640 696 752 832  480 481 484 509 -hsync -vsync (43.3 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "640x480": 31.5 MHz (scaled from 0.0 MHz), 37.9 kHz, 72.8 Hz
[    50.510] (II) NOUVEAU(0): Modeline "640x480"x72.8   31.50  640 664 704 832  480 489 491 520 -hsync -vsync (37.9 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "640x480": 31.5 MHz (scaled from 0.0 MHz), 37.5 kHz, 75.0 Hz
[    50.510] (II) NOUVEAU(0): Modeline "640x480"x75.0   31.50  640 656 720 840  480 481 484 500 -hsync -vsync (37.5 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "640x480": 25.2 MHz (scaled from 0.0 MHz), 31.5 kHz, 60.0 Hz
[    50.510] (II) NOUVEAU(0): Modeline "640x480"x60.0   25.20  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "720x400": 35.5 MHz (scaled from 0.0 MHz), 37.9 kHz, 85.0 Hz
[    50.510] (II) NOUVEAU(0): Modeline "720x400"x85.0   35.50  720 756 828 936  400 401 404 446 -hsync +vsync (37.9 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "720x400": 28.3 MHz (scaled from 0.0 MHz), 31.5 kHz, 70.1 Hz
[    50.510] (II) NOUVEAU(0): Modeline "720x400"x70.1   28.32  720 738 846 900  400 412 414 449 -hsync +vsync (31.5 kHz e)
[    50.510] (**) NOUVEAU(0):  Driver mode "640x400": 31.5 MHz (scaled from 0.0 MHz), 37.9 kHz, 85.1 Hz
[    50.510] (II) NOUVEAU(0): Modeline "640x400"x85.1   31.50  640 672 736 832  400 401 404 445 -hsync +vsync (37.9 kHz e)
[    50.512] (**) NOUVEAU(0):  Driver mode "640x350": 31.5 MHz (scaled from 0.0 MHz), 37.9 kHz, 85.1 Hz
[    50.512] (II) NOUVEAU(0): Modeline "640x350"x85.1   31.50  640 672 736 832  350 382 385 445 +hsync -vsync (37.9 kHz e)
[    50.512] (==) NOUVEAU(0): DPI set to (96, 96)
[    50.512] (II) Loading sub module "fb"
[    50.512] (II) LoadModule: "fb"
[    50.513] (II) Loading /usr/lib/xorg/modules/libfb.so
[    50.550] (II) Module fb: vendor="X.Org Foundation"
[    50.550]    compiled for 1.13.2, module version = 1.0.0
[    50.550]    ABI class: X.Org ANSI C Emulation, version 0.4
[    50.550] (II) Loading sub module "exa"
[    50.550] (II) LoadModule: "exa"
[    50.550] (II) Loading /usr/lib/xorg/modules/libexa.so
[    50.573] (II) Module exa: vendor="X.Org Foundation"
[    50.574]    compiled for 1.13.2, module version = 2.6.0
[    50.574]    ABI class: X.Org Video Driver, version 13.1
[    50.575] (II) Loading sub module "shadowfb"
[    50.575] (II) LoadModule: "shadowfb"
[    50.578] (II) Loading /usr/lib/xorg/modules/libshadowfb.so
[    50.580] (II) Module shadowfb: vendor="X.Org Foundation"
[    50.580]    compiled for 1.13.2, module version = 1.0.0
[    50.580]    ABI class: X.Org ANSI C Emulation, version 0.4
[    50.580] (II) UnloadModule: "vesa"
[    50.580] (II) Unloading vesa
[    50.580] (II) UnloadModule: "modesetting"
[    50.580] (II) Unloading modesetting
[    50.580] (II) UnloadModule: "fbdev"
[    50.580] (II) Unloading fbdev
[    50.580] (II) UnloadSubModule: "fbdevhw"
[    50.580] (II) Unloading fbdevhw
[    50.582] (--) Depth 24 pixmap format is 32 bpp
[    50.588] (II) NOUVEAU(0): Opened GPU channel 0
[    50.589] (II) NOUVEAU(0): [DRI2] Setup complete
[    50.595] (II) NOUVEAU(0): [DRI2]   DRI driver: nouveau_vieux
[    50.595] (II) NOUVEAU(0): [DRI2]   VDPAU driver: nouveau_vieux
[    50.634] (II) EXA(0): Driver allocated offscreen pixmaps
[    50.634] (II) EXA(0): Driver registered support for the following operations:
[    50.634] (II)         Solid
[    50.634] (II)         Copy
[    50.634] (II)         Composite (RENDER acceleration)
[    50.634] (II)         UploadToScreen
[    50.634] (II)         DownloadFromScreen
[    50.634] (==) NOUVEAU(0): Backing store disabled
[    50.634] (==) NOUVEAU(0): Silken mouse enabled
[    50.634] (==) NOUVEAU(0): DPMS enabled
[    50.635] (II) NOUVEAU(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[    50.670] (--) RandR disabled
[    50.758] (II) SELinux: Disabled by boolean
[    50.948] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[    50.948] (II) AIGLX: enabled GLX_INTEL_swap_event
[    50.948] (II) AIGLX: enabled GLX_ARB_create_context
[    50.948] (II) AIGLX: enabled GLX_ARB_create_context_profile
[    50.948] (II) AIGLX: enabled GLX_EXT_create_context_es2_profile
[    50.948] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
[    50.948] (II) AIGLX: Loaded and initialized nouveau_vieux
[    50.953] (II) GLX: Initialized DRI2 GL provider for screen 0
[    50.958] (II) NOUVEAU(0): NVEnterVT is called.
[    50.958] (II) NOUVEAU(0): Setting screen physical size to 270 x 203
[    50.959] resize called 1024 768
[    51.863] (II) config/udev: Adding input device Power Button (/dev/input/event1)
[    51.864] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[    51.864] (**) Power Button: Applying InputClass "anaconda-keyboard"
[    51.864] (II) LoadModule: "evdev"
[    51.866] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[    51.889] (II) Module evdev: vendor="X.Org Foundation"
[    51.889]    compiled for 1.13.1, module version = 2.7.3
[    51.889]    Module class: X.Org XInput Driver
[    51.890]    ABI class: X.Org XInput driver, version 18.0
[    51.890] (II) Using input driver 'evdev' for 'Power Button'
[    51.890] (**) Power Button: always reports core events
[    51.890] (**) evdev: Power Button: Device: "/dev/input/event1"
[    51.890] (--) evdev: Power Button: Vendor 0 Product 0x1
[    51.891] (--) evdev: Power Button: Found keys
[    51.891] (II) evdev: Power Button: Configuring as keyboard
[    51.891] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1/event1"
[    51.891] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 6)
[    51.891] (**) Option "xkb_rules" "evdev"
[    51.891] (**) Option "xkb_model" "evdev"
[    51.891] (**) Option "xkb_layout" "fr,us"
[    51.891] (**) Option "xkb_options" "grp:alt_shift_toggle"
[    52.167] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[    52.167] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[    52.167] (**) Power Button: Applying InputClass "anaconda-keyboard"
[    52.167] (II) Using input driver 'evdev' for 'Power Button'
[    52.167] (**) Power Button: always reports core events
[    52.167] (**) evdev: Power Button: Device: "/dev/input/event0"
[    52.167] (--) evdev: Power Button: Vendor 0 Product 0x1
[    52.167] (--) evdev: Power Button: Found keys
[    52.167] (II) evdev: Power Button: Configuring as keyboard
[    52.168] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0/event0"
[    52.168] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 7)
[    52.168] (**) Option "xkb_rules" "evdev"
[    52.168] (**) Option "xkb_model" "evdev"
[    52.168] (**) Option "xkb_layout" "fr,us"
[    52.168] (**) Option "xkb_options" "grp:alt_shift_toggle"
[    52.170] (II) config/udev: Adding drm device (/dev/dri/card0)
[    52.177] (II) config/udev: Adding input device AT Translated Set 2 keyboard (/dev/input/event2)
[    52.179] (**) AT Translated Set 2 keyboard: Applying InputClass "evdev keyboard catchall"
[    52.179] (**) AT Translated Set 2 keyboard: Applying InputClass "anaconda-keyboard"
[    52.179] (II) Using input driver 'evdev' for 'AT Translated Set 2 keyboard'
[    52.179] (**) AT Translated Set 2 keyboard: always reports core events
[    52.179] (**) evdev: AT Translated Set 2 keyboard: Device: "/dev/input/event2"
[    52.179] (--) evdev: AT Translated Set 2 keyboard: Vendor 0x1 Product 0x1
[    52.179] (--) evdev: AT Translated Set 2 keyboard: Found keys
[    52.179] (II) evdev: AT Translated Set 2 keyboard: Configuring as keyboard
[    52.179] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio0/input/input2/event2"
[    52.179] (II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type: KEYBOARD, id 8)
[    52.180] (**) Option "xkb_rules" "evdev"
[    52.180] (**) Option "xkb_model" "evdev"
[    52.180] (**) Option "xkb_layout" "fr,us"
[    52.180] (**) Option "xkb_options" "grp:alt_shift_toggle"
[    52.183] (II) config/udev: Adding input device ImExPS/2 Generic Explorer Mouse (/dev/input/event3)
[    52.183] (**) ImExPS/2 Generic Explorer Mouse: Applying InputClass "evdev pointer catchall"
[    52.183] (II) Using input driver 'evdev' for 'ImExPS/2 Generic Explorer Mouse'
[    52.183] (**) ImExPS/2 Generic Explorer Mouse: always reports core events
[    52.183] (**) evdev: ImExPS/2 Generic Explorer Mouse: Device: "/dev/input/event3"
[    52.184] (--) evdev: ImExPS/2 Generic Explorer Mouse: Vendor 0x2 Product 0x6
[    52.184] (--) evdev: ImExPS/2 Generic Explorer Mouse: Found 9 mouse buttons
[    52.184] (--) evdev: ImExPS/2 Generic Explorer Mouse: Found scroll wheel(s)
[    52.184] (--) evdev: ImExPS/2 Generic Explorer Mouse: Found relative axes
[    52.184] (--) evdev: ImExPS/2 Generic Explorer Mouse: Found x and y relative axes
[    52.184] (II) evdev: ImExPS/2 Generic Explorer Mouse: Configuring as mouse
[    52.184] (II) evdev: ImExPS/2 Generic Explorer Mouse: Adding scrollwheel support
[    52.184] (**) evdev: ImExPS/2 Generic Explorer Mouse: YAxisMapping: buttons 4 and 5
[    52.184] (**) evdev: ImExPS/2 Generic Explorer Mouse: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    52.185] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input3/event3"
[    52.185] (II) XINPUT: Adding extended input device "ImExPS/2 Generic Explorer Mouse" (type: MOUSE, id 9)
[    52.185] (II) evdev: ImExPS/2 Generic Explorer Mouse: initialized for relative axes.
[    52.186] (**) ImExPS/2 Generic Explorer Mouse: (accel) keeping acceleration scheme 1
[    52.186] (**) ImExPS/2 Generic Explorer Mouse: (accel) acceleration profile 0
[    52.186] (**) ImExPS/2 Generic Explorer Mouse: (accel) acceleration factor: 2.000
[    52.186] (**) ImExPS/2 Generic Explorer Mouse: (accel) acceleration threshold: 4
[    52.187] (II) config/udev: Adding input device ImExPS/2 Generic Explorer Mouse (/dev/input/mouse0)
[    52.188] (II) No input driver specified, ignoring this device.
[    52.188] (II) This device may have been added with another device file.
Bon je cherche encore, donc toujours de F16 vers F18 avec un ssh -X

$  LIBGL_DEBUG=verbose  glxinfo| head
libGL: OpenDriver: trying /usr/lib/dri/nouveau_dri.so
libGL error: failed to authenticate magic 3
libGL error: failed to load driver: nouveau
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
name of display: localhost:10.0
display: localhost:10  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_INTEL_swap_event, 
    GLX_MESA_copy_sub_buffer, GLX_OML_swap_method, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
$  LIBGL_DEBUG=verbose LIBGL_ALWAYS_INDIRECT=y  glxinfo| head
name of display: localhost:10.0
display: localhost:10  screen: 0
direct rendering: No (LIBGL_ALWAYS_INDIRECT set)
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_INTEL_swap_event, 
    GLX_MESA_copy_sub_buffer, GLX_OML_swap_method, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
$  LIBGL_DEBUG=verbose  glxinfo | grep OpenGL\ vendor\ string
libGL: OpenDriver: trying /usr/lib/dri/nouveau_dri.so
libGL error: failed to authenticate magic 5
libGL error: failed to load driver: nouveau
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
OpenGL vendor string: VMware, Inc.
$  LIBGL_DEBUG=verbose LIBGL_ALWAYS_INDIRECT=y  glxinfo | grep OpenGL\ vendor\ string
OpenGL vendor string: nouveau
$  LIBGL_DEBUG=verbose  glxinfo | grep OpenGL\ vendor\ string
libGL: OpenDriver: trying /usr/lib/dri/nouveau_dri.so
libGL error: failed to authenticate magic 7
libGL error: failed to load driver: nouveau
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
OpenGL vendor string: VMware, Inc.
Le LIBGL_ALWAYS_INDIRECT élimine sans doutes des problémes et l'utlisation d'une connexion filiaire améliore les choses ce qui me laisse penser que j'ai aussi un souci de bande passante.

On s'approche du jet d'éponge à grand pas
Minifig wrote:Je souhaite depuis le client accéder à des applications graphiques sur le serveur en utilisant ssh -X users@XXX.XXX.XXX.XXX en local pour l'instant. Mais l'affichage est lent/sacader ce qui rend le truc inutilisable avec certains programmes et donne des messages d'erreurs/alertes. En se connectant directement sur le serveur je ne retrouve pas ce comportement.
Fais un essai en utilisant -XC au lieu de -X
-C Requests compression of all data (including stdin, stdout,
stderr, and data for forwarded X11 and TCP connections). The
compression algorithm is the same used by gzip(1), and the
“level” can be controlled by the CompressionLevel option for pro‐
tocol version 1. Compression is desirable on modem lines and
other slow connections, but will only slow down things on fast
networks. The default value can be set on a host-by-host basis
in the configuration files; see the Compression option.
Testes ta bande passante avec iperf, c'est un point important à verifier avant de faire du déport d'affichage.
Boujour,

Merci pour vos indications, je teste cela en fin de journée.

Pour info, quelle est la limite basse pour espérer avoir du déport d'affichage ?

Bonne journée.
pas évident de donner une bande passante idéale. Sur du 100Mbps ça doit passer normalement sans problème. Après, comme tu veux pas utiliser ta carte video avec les pilotes nvidia, c'est le CPU qui travaille beaucoup, + la compression et le chiffrement ssh ça doit pas l'aider.
# systemctl stop firewalld.service
# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.14 port 5001 connected with 192.168.0.12 port 54795
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.3 sec  11.6 MBytes  9.49 Mbits/sec
et 
$ iperf -c 192.168.0.14
------------------------------------------------------------
Client connecting to 192.168.0.14, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.12 port 54795 connected with 192.168.0.14 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.2 sec  11.6 MBytes  9.54 Mbits/sec

Je n'avais pas le souvenir de devoir jouer avec le pare feu pour qu'iperf fonctionne.


et avec la configuration inverse : 
$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.12 port 5001 connected with 192.168.0.14 port 37131
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-11.1 sec  19.4 MBytes  14.7 Mbits/sec
# iperf -c 192.168.0.12
------------------------------------------------------------
Client connecting to 192.168.0.12, TCP port 5001
TCP window size: 21.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.14 port 37131 connected with 192.168.0.12 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.6 sec  19.4 MBytes  15.3 Mbits/sec
Maintenant le test avec la compression sur ssh, 
$  LIBGL_ALWAYS_INDIRECT=y LIBGL_DEBUG=verbose  glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
23747 frames in 5.0 seconds = 4730.084 FPS
3506 frames in 5.3 seconds = 660.639 FPS
3637 frames in 5.6 seconds = 651.917 FPS
3897 frames in 5.7 seconds = 688.031 FPS
3896 frames in 5.6 seconds = 692.987 FPS
3637 frames in 5.7 seconds = 636.846 FPS
3768 frames in 5.1 seconds = 739.826 FPS
3246 frames in 5.1 seconds = 639.735 FPS
- l'affichage de l'engrenage est pas top du tout.
- l'utilisation reseau et de l'ordre de 10-50kio/s selon la direction.

Je suis un peu déçu du résultat.
T'es deçu d'avoir ~660FPS sur glxgears (qui n'est pas un outil de bench) en utilisant les pilotes libres?? Tu vises combien?

sinon 15Mbits/sec c'est peu, mais si tu constates une utilisation de 10 à 50ko/s lors de l'export display ça doit passer. Tu peux aussi jouer avec ping pour voir, en dehors du débit, la qualité de la connexion: 
ping -f ip_machie_distante -s taille_paquet
en testant différentes tailles de paquets (1500 max), et voir le % de paquets perdus.

ps: oui pour iperf il faut autoriser le port dans le parefeu (ou le couper temporairement comme tu as fais), ya pas trop le choix.
J'ai mal formulé les choses.
Effectivement, j'ai un en viron 660FPS avec glxgears mais la fluidité de l'affichage n'est pas celle correspondante.
comment tu mesurais tes 10 à 50kio/s? Parce que chez, glxgears en export display, c'est 9Mb/s avec des pointe à 15Mb/s!