I encountered the same problem (at least it's the same symptoms). This seems to
be a bug with the backlight (possibly
http://www.mail-archive.com/[email protected]/msg18396.html, n
ot sure how nouveau is related - I got hit by this on an Intel HD4000).
Luckily, I've found a quick workaround for this. Run this as root (sudo -s):
cat << EOF >> /etc/pm/sleep.d/60intel
#!/bin/sh
# Force backlight on after resume
case "$1" in
thaw|resume)
cd /sys/class/backlight/intel_backlight
cat max_brightness >brightness
;;
*)
exit $NA
;;
esac
EOF
chmod +x /etc/pm/sleep.d/60intel
That's it. This tells the system to set the backlight to full on resume. Even
if it is already set to full, this causes the video driver to re-enable the
backlight. Instead of max_brightness, one could also use actual_brightness to
reset to the old value.
Of course the cd line would need to be changed according to the backlight
driver (whatever's there in /sys/class/backlight), like I said, this version
works on an Intel HD4000, it needs modification on non-Intel obviously.
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https://bugs.launchpad.net/bugs/1130938
Title:
Black screen after resuming from suspend [Dell XPS 15z]
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