How to force Xorg/Firefox to use iGPU instead of discrete nvidia card on a Clevo laptop?

[Sérgio Basto]

On Mon, 2021-03-22 at 20:56 -0300, Dan wrote:
> 	I have a Clevo compatible laptop with a Intel integrated GPU
> and a discrete nVidia GPU. It seems the nVidia card is connected to
> the
> video output (displayport):
> 
> ~$ xrandr --listproviders
> Providers: number : 2
> Provider 0: id: 0x1b8 cap: 0x1, Source Output crtcs: 4 outputs: 5
> associated providers: 0 name:NVIDIA-0
> Provider 1: id: 0x200 cap: 0xa, Sink Output, Sink Offload crtcs: 3
> outputs: 1 associated providers: 0 name:modesetting
> 
> ~$ lspci | grep VGA
> 00:02.0 VGA compatible controller: Intel Corporation CoffeeLake-H GT2
> [UHD Graphics 630] (rev 02)
> 01:00.0 VGA compatible controller: NVIDIA Corporation TU106M [GeForce
> RTX 2070 Mobile] (rev a1)
> 
> 	When I try to force Xorg to use only the Intel integrated GPU,
> nothing is displayed on the screen, so I'm stuck with the nVidia
> card.

We usually have the opposite problem. we want to enable discrete nvidia card by default, please try reverse these options [1] 

[1]
https://rpmfusion.org/Howto/Optimus#Finer-Grained_Control_of_GLX_.2B-_OpenGL 

	
> 	I read the README.txt from nVidia driver and as far as I
> understood, I should use Reverse PRIME in order to use the Intel GPU.
> What's interesting is that I can interact with the Intel iGPU. For
> example:
> 
> $ vainfo --display drm
> libva info: VA-API version 1.8.0
> libva info: Trying to open /usr/xorg/lib64/dri/iHD_drv_video.so
> libva info: va_openDriver() returns -1
> libva info: Trying to open /usr/xorg/lib64/dri/i965_drv_video.so
> libva info: Found init function __vaDriverInit_1_8
> libva info: va_openDriver() returns 0
> vainfo: VA-API version: 1.8 (libva 2.8.0)
> vainfo: Driver version: Intel i965 driver for Intel(R) Coffee Lake -
> 2.4.1
> vainfo: Supported profile and entrypoints
>       VAProfileMPEG2Simple            : VAEntrypointVLD
>       VAProfileMPEG2Simple            : VAEntrypointEncSlice
>       VAProfileMPEG2Main              : VAEntrypointVLD
>       VAProfileMPEG2Main              : VAEntrypointEncSlice
>       VAProfileH264ConstrainedBaseline: VAEntrypointVLD
>       VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
>       VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP
>       VAProfileH264Main               : VAEntrypointVLD
>       VAProfileH264Main               : VAEntrypointEncSlice
>       VAProfileH264Main               : VAEntrypointEncSliceLP
>       VAProfileH264High               : VAEntrypointVLD
>       VAProfileH264High               : VAEntrypointEncSlice
>       VAProfileH264High               : VAEntrypointEncSliceLP
> 
> 	So, is there a way to force Xorg to use only the Intel GPU? Or
> at least force Firefox to use only the Intel GPU, so I can have video
> acceleration?
> 
> 	Thanks!
> 
> 	Ps: I attached the Xorg.0.log file.
> 
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-- 
Sérgio M. B.