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kms: Inhibit kernel thread on amdgpu

Daniel van Vugt requested to merge vanvugt/mutter:deny-amdgpu-realtime into main

Recent AMD Ryzen systems are experiencing a problem whereby gnome-shell gets SIGKILLed by the kernel. It seems to be related to a violation of RLIMIT_RTTIME in the KMS thread.

This is the simplest/safest workaround we have right now. Longer term we would like to:

  1. Find out what call is blocking in amdgpu to trigger it; and
  2. Graceful handling of SIGXCPU before SIGKILL happens.

Closes: #3037 (closed)

Edited by Daniel van Vugt

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