[Bug 261218] graphics/drm-devel-kmod screens blacked out, system freeze, around two minutes after waking from sleep

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261218

--- Comment #1 from Graham Perrin <[email protected]> ---
(In reply to Graham Perrin from comment #0)

First attempt to reproduce the bug: not reproducible. 

% grep -e suspend -e BOOT /var/log/messages | tail -n 2
Jan 15 06:32:09 mowa219-gjp4-8570p-freebsd kernel: ---<<BOOT>>---
Jan 15 12:04:21 mowa219-gjp4-8570p-freebsd acpi[26301]: suspend at 20220115
12:04:21
% 

Sleep (with the script) at 12:04:21, switched off the Philips display. Woke the
computer after around ninety seconds of sleep, waited for things to
automatically rearrange themselves on the sole display. Switched on the
Philips, xrandr, waited for things to automatically rearrange themselves across
both displays, dragged most windows to the display on the right, continued
working. Fine so far, touch wood. Feels rock solid. Notably: 

* no trouble with the USB keyboard or trackball on this occasion.

Whilst it did take some time for the system to respond to USB keyboard input, I
treat delays such as this, after wake from sleep, as normal with FreeBSD.

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