[Bug 111481] AMD Navi GPU frequent freezes on both Manjaro/Ubuntu with kernel 5.3 and mesa 19.2 -git/llvm9

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Comment # 154 on bug 111481 from
I'm not sure about how to locally pipe dmesg log to file so the moment when the
system freezes could be captured.

And interestingly, the GCVM_L2_PROTECTION_FAULT errors that I saw from
journalctl when it froze last time went missing somehow... maybe I mistook it,
but whenever the system froze the following lines are guaranteed to show up
(ring sdma0 timeout), so it's most likely sdma0 type.

[drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0 timeout, signaled
seq=151787, emitted seq=151789
[drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process Xorg
pid 1838 thread Xorg:cs0 pid 1862

Currently the system is running okay as I haven't opened Nemo yet (which can
almost 100% cause the freeze). Web browsers such as Firefox and Chrome
currently don't cause the freeze.


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