[Bug 276985] crash in LinuxKPI/drm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276985

--- Comment #58 from Tomasz "CeDeROM" CEDRO <tomek@cedro.info> ---
one more test of openarena drm crash on drm-510-kmod and possibly other drm
versions as observed with drm-61-kmod:

1. on my system i had to set `sysctl hw.efi.poweroff=0` in order for power
button to poweroff after shutdown. without this shutdown occurred but power was
not terminated at the end screen was on with shutdown console message etc. this
is important to see if machine can be powered off safely with power button on
drm crash without panic.
2. i have loaded amdgpu, stared xorg, launched some movie in firefox to have
audio playback, started openarena to trigger a problem, screen hung, no mouse
was visible anymore, no keyboard input, audio was still playing, system was
unresponsive from user perspective, but does not look like kernel panic because
audio was still working.
3. i have pressed power button to trigger system shutdown.
4. firefox video playback stopped quickly after power button press as the sound
disappeared. looks like shutdown was triggered correctly.
5. after some time screens went blank (no signal / unsupported signal depending
on the monitor).
6. after some more time system did power off.

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