Hello! I have recently updated my OS in hopes to get this issue solved. The results are... well, the same. Updating my Operating System did not change the error at all; I still get a Errror 303. I have tried using non-beta SteamVR, linux v_1.14 SteamVR, and also have tried forcing Photon Experimental with no avail.
Here is what my screen looks like today:

...And here are my updated OS information (the kernel, drivers should be the same)
Ubuntu 22.04.1 LTS (Jammy Jellyfish) ←updatedbeta 1.25.2 ←updatedDec 19 2022 ←updatedYesvulkaninfo | grep driverInfo driverInfo = Mesa 22.3.1
driverInfo = Mesa 22.3.1
driverInfo = Mesa 22.3.1 (LLVM 14.0.6)
driverInfo = Mesa 22.3.1 (LLVM 14.0.6)
↑¿what the... for some reason, this command no longer outputs wrong ELF class: ELFCLASS32 Error.
Gist: SteamVR System Report created Fri Dec 23 20:27:57 2022
After a while of tweaking, it seems that every time I unplug and replug the tethering cable together, SteamVR would always give me a Error -203. And when I restart headset, the Error will go back to 303.



Removing the word "beta" because I have tested on non-beta SteamVR as well as non-beta Proton experimental with the same problem.
I have the same issue with steamvr beta 2.1.7: https://github.com/ValveSoftware/SteamVR-for-Linux/issues/639#issuecomment-1826775962 (that post contains a temporary workaround)
Just throwing this out there, do you have the DRI3 extension enabled?
$ xdpyinfo
...
number of extensions: 28
...
DRI2
DRI3 ← need this
...
The amdgpu xorg driver silently disables it if the mesa libraries don't match the ones it was built with exactly. Well, not exactly silently, it does log a message in your xorg log file, but good luck noticing that.
Without DRI3, SteamVR gives all sort of strange and variable error messages.
Works in SteamVR 2.1.8 :)
https://github.com/ValveSoftware/SteamVR-for-Linux/issues/553#issuecomment-1833110353 , I have DRI3 but I had the issue at the time I posted it.
proton experimentalx1 2022-12
Summary
I have recently upgraded my GPU from
AMD Radeon RX 580toAMD Radeon RX 6600 XT.However,
SteamVR[beta]now returns aCode 303 "Something is Wrong"with this new GPUAMD Radeon RX 6600 XT.Screenshot
Before GPU Upgrade
After GPU Upgrade
Steps to Reproduce
Expected behavior
System Information
Ubuntu 20.04.5 LTS x86_64beta 1.25.1Dec 15 2022Yesvulkaninfo | grep driverInfoRelated?
Error 303 A key component of SteamVR isn't working correctly - SteamVR Linux on Steam Community
https://github.com/ValveSoftware/SteamVR-for-Linux/issues/552
Note
Commenters who are also experiencing this issue are encouraged to include the "System Information" section in their replies.