Merci, sous xorg , voici mes retours
[non@localhost ~]$ echo $WAYLAND_DISPLAY
[non@localhost ~]$ xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x43 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 1 associated providers: 0 name:modesetting
[non@localhost ~]$ xrandr --setprovideroffloadsink nouveau Intel
Could not find provider with name nouveau
[non@localhost ~]$
il semble manquer une carte graphique par rapport à l'exemple de la doc
$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x8a cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 2 outputs: 2 associated providers: 1 name:Intel
Provider 1: id: 0x66 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 5 associated providers: 1 name:nouveau
je retape
lspci | grep -E "3D|VGA"
et la je vois toujours mes deux cartes intel et nvidia
00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GP106M [GeForce GTX 1060 Mobile] (rev a1)