[Bug 105733] Amdgpu randomly hangs and only ssh works. Mouse cursor moves sometimes but does nothing. Keyboard stops working.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105733

--- Comment #45 from Kent Ross <root.main at gmail.com> ---
This happens to me as well. I first noticed it occurring when I had a
double-GPU setup, but since then I have completely reinstalled with only the
AMD gpu (a Vega 64) and it still happens. The failures are similar to those
bernhardu notes. I have not had a failure simply using Chrome and desktop
applications yet, but it is typically reproducible between 5 and 60 minutes in
a 3D game like Dota 2.

I suspected it might be related to memory stability, but the machine it happens
on happily passes both memtest and mprime. The lockup still occurs even when
the memory is underclocked by 25% (retaining the same timings and voltage, so
that's a full 25% overhead for every command).

I have:

- Intel 7980XE cpu
- Ubuntu Cosmic, linux-image-4.18.0-11-generic
- default amdgpu drivers

I have also tried updated amdgpu packages from ppa:oibaf/graphics-drivers; the
failure is the same.

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