[Bug 107928] Screen regularly turns black, reboot needed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107928

--- Comment #10 from Matthew Vaughn <nethershaw at gmail.com> ---
I've determined that the deadlock and stack trace found in my dmesg logs is
emitted precisely when I attempt to wake the machine's display from sleep by
touching the keyboard or mouse, and not before.

If I leave the machine on a terminal console instead of in a running X session,
the display never sleeps, and the deadlock never occurs.

The first instance of the deadlock on my machine occurred during a session
following an upgrade of the xf86-video-amdgpu drivers from version 18.0.1 to
18.1.0, and simultaneously, of Mesa to a checkout of the master branch ca.
commit 0d495bec25bd7584de4e988c2b4528c1996bc1d0, or approximately 2018-09-26
04:16 UTC. I am attempting now to revert both of these upgrades one at a time
in order to determine whether either of them is implicated.

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