[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 #176 from L.S.S. <ragnaros39216 at yandex.com> ---
Unfortunately this still happens with Nemo on 5.4-rc4 kernel (official), after
switching to Manjaro Testing channel.

The same ring sdma0 timeout error appears. An interesting phenomenon is that
when the screen freezes (taskbar clock stopped changing), at first the mouse
can still move, but after a few clicks the mouse stopped moving and the screen
appears to have shifted to a previous frame before freezing completely:

The contents of the previous folder would reappear in Nemo, and the taskbar
clock may sometimes move a second backwards.

I've removed AMD_DEBUG=nodma since it apparently doesn't work. If the patches
are meant for 5.4-rc4, which patches are needed to address this problem?

For now I'm using nnn (a terminal-based file manager) for browsing files since
terminals don't freeze the system... I'm not sure what might be triggering the
freeze as all the lockups I have so far all happened when using Nemo. Other
programs (including Firefox and Chromium) haven't triggered the freeze yet.

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