I can confirm this regression in 3.8.0-22. Only noticed it when I went
on battery today.
Fix for me was the same as beerfan above. I also went one step further
and added:
echo 0 > /sys/class/backlight/intel_backlight/brightness
to rc.local and the following:
#!/bin/sh
# to fix backlight issues on resume
case "${1}" in
resume)
echo 0 > /sys/class/backlight/intel_backlight/brightness
;;
esac
to /etc/pm/sleep.d/99-backlightfix (remember to make it executable!).
Might need to alter it a bit to make it work for hibernate but
brightness control works on resume. Will test again on the next kernel
update.
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https://bugs.launchpad.net/bugs/954661
Title:
backlight brightness not adjustable by default on Dell XPS 13
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