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docs: Add Vulkan section to PRIME.md.

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Arkadiusz Hiler 2021-07-16 17:21:35 +03:00 committed by Andrew Eikum
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@ -60,6 +60,44 @@ In Steam set your game's Properties -> GENERAL -> LAUNCH OPTIONS to:
__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia %command%
## Vulkan
In case Vulkan games don't allow you to select a GPU or you experience
problems with graphics APIs implemented on top of Vulkan you can limit or
alter the GPU selection.
### AMD -> Integrated Intel (Mesa -> Mesa)
In Steam, set your game's Properties -> GENERAL -> LAUNCH OPTIONS to:
DRI_PRIME=1 %command%
This will cause the devices to change order, i.e. the first GPU will swap
places with another one.
You can also limit the selection using Mesa's DEVICE_SELECT Vulkan layer. To
list the GPUs:
$ MESA_VK_DEVICE_SELECT=list vulkaninfo
selectable devices:
GPU 0: 1002:67df "AMD RADV POLARIS10 (ACO)" discrete GPU 0000:01:00.0
GPU 1: 8086:412 "Intel(R) HD Graphics 4600 (HSW GT2)" integrated GPU 0000:00:02.0
Then set the launch options using one of the vendor and product ids, e.g.:
DRI_PRIME=1 MESA_VK_DEVICE_SELECT=1002:67df $command%
### Nvidia -> Integrated Intel (Nvidia's Proprietary Driver -> Mesa)
In Steam set your game's Properties -> GENERAL -> LAUNCH OPTIONS to:
__NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only %command%
This will load the Optimus Vulkan layer and use it to limit the GPU selection
to NVIDIA only. Using `non_NVIDIA_only` will do the opposite.
# Troubleshooting
## Performance