this post was submitted on 22 Mar 2024
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I want to buy used laptop with rx6600m and r7 5800h
Does switch between discrete gpu and apu work on linux for amd gpus?
Maybe there are some pitfalls?

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[–] [email protected] 3 points 8 months ago (1 children)

Hmm... are you sure about that?

$ DRI_PRIME=1 glxinfo | grep "OpenGL renderer"
OpenGL renderer string: Gallium 0.4 on AMD TURKS

DRI_PRIME=1 switches to the discrete GPU (or used to at least - I don't have hybrid graphics anymore). I'd be surprised if that feature were removed...

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[–] [email protected] 4 points 8 months ago (2 children)

This is render offloading, not GPU switching. GPU switching implies switching the primary rendering device (the one power the displays) entirely rather than rendering on a separate GPU and copying the output to the primary.

[–] [email protected] 7 points 8 months ago

Most gaming laptops these days don't support true GPU switching as it requires a hardware mux to switch the display between the GPUs. Every gaming laptop I've used from the past decade has been muxless and only used render offloading.

[–] [email protected] 3 points 8 months ago

I see! Thanks for clearing that up.