Hello @a3d0n, this issue should also be mentioned to your video driver vendor.
@kisak-valve
Yup it was, sorry about this report can be closed, ill inquire further regression with the Mesa team.
The following launch option fixes video encode error:
RADV_PERFTEST=video_decode,video_encode DRI_PRIME=1 ~/.local/share/Steam/steamapps/common/SteamVR/bin/vrmonitor.sh %command%
To follow up, mesa 25.2.7 has a regression reported at https://gitlab.freedesktop.org/mesa/mesa/-/issues/14285 and triaged in https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38417.
To follow up, mesa 25.2.7 has a regression reported at https://gitlab.freedesktop.org/mesa/mesa/-/issues/14285 and triaged in https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38417.
Do you know if this also fixes it for me with my RX 6800? Tried Mint, CachyOS, Mesa 25.2.6, Mesa 25.3.0 etc.
I only get the famous error 499 on SteamVR.
Same error, Quest 2, Fedora 43, RX 6700 XT
Same error, Quest 2, Fedora 43, RX 6700 XT
Check if you can update to Mesa 25.3.1, or higher that solved it for me. SteamVR is still garbage on Linux but at least I can connect now.
As for the Visual Glitching, the fix was to turn off the Integrated Graphics in BIOS.
Seems SteamVR tries to use the integrated graphics even though params that specify the dedicated GPU are there but disregarded.
So as of now with my GPU on Mesa 25.3.2-1 it works and plays.
Quick Session of HL:Alyx and Walkabout Minigolf confirmed it for me.
RADV_PERFTEST=video_decode,video_encodex1 2025-11
Describe the bug
Can't connect to Host PC, Video Encoder Error with a RX 9070 XT
Following Driver:
local/lib32-mesa 1:25.2.7-1
local/lib32-vulkan-mesa-device-select 1:25.2.7-1
local/mesa 1:25.2.7-1
local/mesa-utils 9.0.0-7
local/vulkan-mesa-device-select 1:25.2.7-1
local/vulkan-radeon 1:25.2.7-1
local/lib32-vulkan-radeon 1:25.2.7-1
local/linux-firmware-amdgpu 20251021-1
local/linux-firmware-radeon 20251021-1
Kernel: 6.17.7.arch1-1
Previous driver 25.2.6 doesn't have this issue but has another related to visual degradation. (which i dont think had happen on around mesa 25.1.7 - 25.2.1)

To Reproduce
Steps to reproduce the behavior:
Expected behavior
Connect
System Information (please complete the following information):
Please use the latest Steam beta client and SteamVR beta for your bug reports!
Yes
steamlog-diagnostic.log
tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]steam-logs.tar.gz
tar -zcvf ~/Desktop/steam-minidumps.tar.gz /tmp/dumps]steam-minidumps.tar.gz
Screenshots
Additional context
Tried also with:
~/.local/share/Steam/steamapps/common/SteamVR/bin/vrmonitor.sh %command%
DRI_PRIME=1 ~/.local/share/Steam/steamapps/common/SteamVR/bin/vrmonitor.sh %command%