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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111481

--- Comment #3 from Matthias Müller <saldorin at web.de> ---
I don't know if i'm encountering the same bug, but it is at least similar.
I don't get hard freezes/lockups, but i get a strange "stutterting", as if the
whole OS halted for a few seconds, then continued for a few seconds...and the
halted times grew while the "usable seconds" got shorter quickly to the point
of unusability...

It doesn't happen regularly (seems like anything between 30min and 120min) and
i haven't yet made out a direct cause, but in journalctl, it seems the same
messages appear every time when it begins:

kernel: amdgpu: [powerplay] Failed to send message 0xf, response 0xfffffffb,
param 0xfd6000
kernel: amdgpu: [powerplay] Failed to send message 0xf, response 0xfffffffb,
param 0xfd6000
 kernel: amdgpu 0000:0f:00.0: [mmhub] VMC page fault (src_id:0 ring:169 vmid:0
pasid:0)
 kernel: amdgpu 0000:0f:00.0:   at page 0x0000600000fd6000 from 18
 kernel: amdgpu 0000:0f:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x00041152

after that there are a lot of these:

kernel: amdgpu: [powerplay] Failed to send message 0x40, response 0xffffffc2
param 0x2
kernel: amdgpu: [powerplay] Failed to send message 0xe, response 0xffffffc2,
param 0x80

until shutdown/hardreset.

Maybe some observation that might help to narrow it down:
The first time it occured, i had to do a few reboots that showed this behaviour
right after startup until it finally worked again - for about 45min.
As it didn't work again after around 10 reboots, i tried uninstalling corectrl
(that i used to have a custom fan-curve) - and it finally booted normal again!
I then installed radeon-profile to have fan-controll (i don't want to have the
fans stand still on desktop, as the card gets over 80° C hot before the fans
kick in...).
The issue still occurs with radeon-profile, but at least every reboot is
running fine...
Other thing i noticed is that after the first "freeze" with radeon-profile
lm_sensors stopped reporting the fanspeed for the card, it always stays at
zero.

So maybe it is related to fan-control or the sysfs interface in general?

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