[kwin] [Bug 521914] GpuManager unconditionally opens all render nodes at startup, preventing dGPU power-off on hybrid laptops

[VinVel]

https://bugs.kde.org/show_bug.cgi?id=521914

--- Comment #6 from VinVel <k...@velcore.net> ---
(In reply to Zamundaaa from comment #5)
> The GPU games use and the render nodes KWin opens are pretty much completely
> unrelated to each other. KWin can't force games to (not) use specific GPUs.
> 
> You can use the MESA_VK_DEVICE_SELECT env var to force games to run on
> specific GPUs. That should work on any Vulkan app, with any GPU vendor (as
> long as you have Mesa installed ofc).

Turns out it was user error, oops... Instead of doing
MESA_VK_DEVICE_SELECT=vendorID:deviceID, I did MESA_VK_DEVICE_SELECT=/dev/cardX

Thanks, I suppose 😅

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