Je n'ai pas pensé à chercher l'anomalie du nombre d'écrans, mais j'ai cherché un Xorg Configuration failed.
J'ai donc mis en commentaire le chargement du module glx ainsi que le deuxième screen (la solution que j'ai identifiée sur le texte de l'anomalie que tu as relevée).
$ xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x46 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 4 associated providers: 0 name:Intel
$ cat /var/log/Xorg.0.log |grep -E "WW|EE"
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 60.281] (WW) "glamoregl" will not be loaded unless you've specified it to be loaded elsewhere.
[ 61.111] (WW) Warning, couldn't open module nv
[ 61.112] (EE) Failed to load module "nv" (module does not exist, 0)
[ 61.143] (WW) Falling back to old probe method for fbdev
[ 61.154] (WW) Falling back to old probe method for vesa
[ 61.154] (EE) [drm] Failed to open DRM device for (null): -22
[ 61.459] (EE) modeset(0): eglGetDisplay() failed
[ 61.459] (EE) modeset(0): glamor initialization failed
[ 61.584] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
Le fichier xorg.conf
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
#Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib64/xorg/modules"
FontPath "catalogue:/etc/X11/fontpath.d"
FontPath "built-ins"
EndSection
##Section "Module"
## Load "glx"
##EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
#Section "Monitor"
# Identifier "Monitor1"
# VendorName "Monitor Vendor"
# ModelName "Monitor Model"
#EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "Accel" # [<bool>]
#Option "AccelMethod" # <str>
#Option "Backlight" # <str>
#Option "CustomEDID" # <str>
#Option "DRI" # <str>
#Option "Present" # [<bool>]
#Option "ColorKey" # <i>
#Option "VideoKey" # <i>
#Option "Tiling" # [<bool>]
#Option "LinearFramebuffer" # [<bool>]
#Option "HWRotation" # [<bool>]
#Option "VSync" # [<bool>]
#Option "PageFlip" # [<bool>]
#Option "SwapbuffersWait" # [<bool>]
#Option "TripleBuffer" # [<bool>]
#Option "XvPreferOverlay" # [<bool>]
#Option "HotPlug" # [<bool>]
#Option "ReprobeOutputs" # [<bool>]
#Option "XvMC" # [<bool>]
#Option "ZaphodHeads" # <str>
#Option "VirtualHeads" # <i>
#Option "TearFree" # [<bool>]
#Option "PerCrtcPixmaps" # [<bool>]
#Option "FallbackDebug" # [<bool>]
#Option "DebugFlushBatches" # [<bool>]
#Option "DebugFlushCaches" # [<bool>]
#Option "DebugWait" # [<bool>]
#Option "BufferCache" # [<bool>]
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "SWcursor" # [<bool>]
#Option "HWcursor" # [<bool>]
#Option "NoAccel" # [<bool>]
#Option "ShadowFB" # [<bool>]
#Option "VideoKey" # <i>
#Option "WrappedFB" # [<bool>]
#Option "GLXVBlank" # [<bool>]
#Option "ZaphodHeads" # <str>
#Option "PageFlip" # [<bool>]
#Option "SwapLimit" # <i>
#Option "AsyncUTSDFS" # [<bool>]
#Option "AccelMethod" # <str>
#Option "DRI" # <i>
Identifier "Card1"
Driver "nouveau"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
##Section "Screen"
## Identifier "Screen1"
## Device "Card1"
## Monitor "Monitor1"
## SubSection "Display"
## Viewport 0 0
## Depth 1
## EndSubSection
## SubSection "Display"
## Viewport 0 0
## Depth 4
## EndSubSection
## SubSection "Display"
## Viewport 0 0
## Depth 8
## EndSubSection
## SubSection "Display"
## Viewport 0 0
## Depth 15
## EndSubSection
## SubSection "Display"
## Viewport 0 0
## Depth 16
## EndSubSection
## SubSection "Display"
## Viewport 0 0
## Depth 24
## EndSubSection
##EndSection
Je ne trouve rien de concluant sur le message du DRM : Failed to open DRM device for pci
Par ailleurs, ne faut-il pas d'ailleurs que je bascule le driver de la carte Intel vers le driver nouveau ?