[Bug 105571] [SKL] Occasional display hang on DPMS resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105571

--- Comment #3 from Paul Donohue <freedesktop-bugs at PaulSD.com> ---
This happened again today.

Laptop was last booted on 04/01/2018.  I was working on my laptop on battery
(last time this happened it was on A/C power), closed my laptop lid, opened it
again about a minute later, the backlight did not immediately come on like it
usually does, the backlight came on after a few seconds, but the screen
remained black after the backlight came on.  I closed and re-opened the lid
again, and the backlight turned off and never came back on.

I plugged in an external monitor and managed to enable it, and everything seems
to be working fine on that external monitor.

Same kernel and DMC as before: kernel 4.13.0-37-generic, DMC 1.26

Stack trace in dmesg looks the same as before (I will attach it).  Xorg.0.log
has nothing interesting in it.  /sys/class/drm/card0/error says "No error state
collected".  xrandr says "xrandr: Output eDP1 is not disconnected but has no
modes".  xrandr --verbose says the eDP1 backlight is on, but it definitely is
not.  The brightness buttons on the keyboard don't seem to do anything.

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