Your system information

• Steam client version (build number or date): Built Dec. 15 2022, at 21:27:15
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

Steam logs show that the bundled LLVM version of the runtime is unable to recognize the recently released AMD RX 7900 XTX GPU as a target.

Installing breakpad exception handler for appid(steam)/version(1671236931)
'gfx1100' is not a recognized processor for this target (ignoring processor)
'gfx1100' is not a recognized processor for this target (ignoring processor)
amd: LLVM doesn't support gfx1100, bailing out...
libGL error: glx: failed to create dri3 screen

I can confirm that this also happens for any application that run on a setup where one of the following conditions is not true:

• Mesa is version 22.2.0+
• LLVM version 15.0+
• Mesa built against that version of LLVM

This may be preventing Steam application to be hardware accelerated, as the runtime cannot use the GPU properly. This can also be seen while monitoring the CPU usage. When Steam starts the CPU usage goes crazy high and keeps to that level.

I don't know if games are affected.

Steps for reproducing this issue:

1. Have an AMD RX 7900 XTX
2. Start Steam from the terminal
3. Check the logging
4. Check how the CPU usage is very high while using Steam