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Can I prevent Xorg running on the NVIDIA GPU?
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lars_the_bear
Guru
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Joined: 05 Jun 2024
Posts: 530
PostPosted: Thu Sep 05, 2024 10:47 am    Post subject: Can I prevent Xorg running on the NVIDIA GPU? Reply with quote
Hi folks

I've been struggling to get the NVIDIA discrete GPU working my laptop. which has hybrid Intel/NVIDA graphics. Thanks to various people who have made suggestions, I have made a little progress. If I run certain graphics programs with environement variables

Code:

__NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0 __GLX_VENDOR_LIBRARY_NAME=nvidia


and I see a useful increase in graphics performance.

But...

I _only_ want to use the discrete GPU for applications I select. At present, nvidia-smi tells me it is being used for Xorg. So the discrete GPU never powers down. I don't know what the implications are on a laptop, but I suspect this will trash the battery life.

How can I arrange it so that Xorg starts without using the discrete GPU? I'm guessing that something has to be done in the display manager, but I don't have a clue what.

BR, Lars.
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alamahant
Advocate
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Joined: 23 Mar 2019
Posts: 3918
PostPosted: Sun Sep 08, 2024 3:18 pm    Post subject: Reply with quote
Plz see
https://wiki.gentoo.org/wiki/Hybrid_graphics#Nvidia_PRIME
and use
Code:

nvidia-xconfig --prime

Also plz install
Code:

 x11-misc/prime-run

then run app with
Code:

prime-run <app-name>

Thee is also Optimus
https://wiki.gentoo.org/wiki/NVIDIA/Optimus
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