Waiting for fences timed out on MacBook Pro 2019

[Tomasz Moń]

Hello,

I am having trouble getting Linux to run on MacBook Pro 2019 with
Radeon Pro Vega 20 4 GB. Basically as soon as graphical user interface
starts, the whole system freezes. This happens with every Linux kernel
version I have tried over the last few months, including 5.13.

Using SSH I have been able to read dmesg output:
[  207.113144] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR*
Waiting for fences timed out!
[  207.113168] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR*
Waiting for fences timed out!
[  212.029866] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx
timeout, signaled seq=1022, emitted seq=1024
[  212.030083] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process
information: process Xorg pid 918 thread Xorg:cs0 pid 919
[  212.030276] amdgpu 0000:03:00.0: amdgpu: GPU reset begin!
[  216.030286] amdgpu 0000:03:00.0: amdgpu: failed to suspend display audio
[  227.396593] applesmc: driver init failed (ret=-5)!

How do I debug this further?

Best regards,
Tomasz Moń