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

[Aaron Plattner]

Mesa lumps all of its drivers together under one vendor named "mesa" so 
you are supposed to be able to do something like this:

DRI_PRIME=1 __GLX_VENDOR_LIBRARY_NAME=mesa glxinfo | grep vendor

Unfortunately, Mesa doesn't like something about the GLX fbconfigs the 
NVIDIA driver provides, so it doesn't actually work:

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
X Error of failed request:  GLXBadContext
   Major opcode of failed request:  152 (GLX)
   Minor opcode of failed request:  6 (X_GLXIsDirect)
   Serial number of failed request:  62
   Current serial number in output stream:  61

-- Aaron

On 3/24/21 6:44 AM, Dan wrote:
> On Wednesday, March 24, 2021 2:33 AM, Sérgio Basto <sergio at serjux.com> wrote:
>
>> We usually have the opposite problem. we want to enable discrete nvidia card by default, please try reverse these options [1]
>>
>> [1]
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Frpmfusion.org%2FHowto%2FOptimus%23Finer-Grained_Control_of_GLX_.2B-_OpenGL&data=04%7C01%7Caplattner%40nvidia.com%7Cc5eb3f42dc9547fdba5208d8eecc5ff0%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C1%7C637521908842807820%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a0HaIV6LuWMatH2Vqc%2FWAYYekoKZjqXdVtYjvBn8DGE%3D&reserved=0
> I see. I tried the following:
>
> ~$ __NV_PRIME_RENDER_OFFLOAD=0 __GLX_VENDOR_LIBRARY_NAME=i965 glxinfo|grep vendor
> server glx vendor string: NVIDIA Corporation
> client glx vendor string: NVIDIA Corporation
> OpenGL vendor string: NVIDIA Corporation
>
> ~$ __NV_PRIME_RENDER_OFFLOAD_PROVIDER=modesetting __GLX_VENDOR_LIBRARY_NAME=i965 glxinfo |grep vendor
> server glx vendor string: NVIDIA Corporation
> client glx vendor string: NVIDIA Corporation
> OpenGL vendor string: NVIDIA Corporation
>
> ~$ __NV_PRIME_RENDER_OFFLOAD_PROVIDER=modesetting __GLX_VENDOR_LIBRARY_NAME=i965 vainfo
> libva info: VA-API version 1.8.0
> libva info: Trying to open /usr/xorg/lib64/dri/nvidia_drv_video.so
> libva info: va_openDriver() returns -1
> vaInitialize failed with error code -1 (unknown libva error),exit
>
> No matter what I try, it always defaults to nvidia.
>
> Maybe I'm doing something wrong?
>
> Thanks!
>
>
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