DOOM VFR crashes on AMD GPUs with Mesa; works on AMDGPU-PRO

For workaround, please see lightwo's comment below.

As per Jakesern's Half-Life: Alyx guide and my additional observations, a better solution for this is to install AMDVLK drivers and to force SteamVR as well as any misbehaving games to use RADV. This results in better performance, proper reprojection (especially on SteamVR versions newer than 1.14 where it's broken on RADV) and doesn't require proprietary software.

However, Jakesern's guide goes over using AMD_VULKAN_ICD which is flawed and breaks games that need RADV, causing them to stop rendering if SteamVR Dashboard is ever brought up.

Instead, add this to /etc/environment, making RADV default and bypassing AMD_VULKAN_ICD:

DISABLE_LAYER_AMD_SWITCHABLE_GRAPHICS_1=1
VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/radeon_icd.i686.json:/usr/share/vulkan/icd.d/radeon_icd.x86_64.json

Then, for each game that works better with AMDVLK, set VK_ICD_FILENAMES accordingly (appending %command% in case of Steam launch options). In regards to this issue, this is required for the game to run at all:

VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/amd_icd32.json:/usr/share/vulkan/icd.d/amd_icd64.json

SteamVR and games that require RADV don't require the variable to be set since the /etc/environment variables ensured that it's used by default.

Thanks for the detailed guide! I've edited the issue description.

changed the description