Originally Posted by
ping-wu
Installed 13.04 into one of the partitions of an Acer Aspire 15.6" notebook. Problem: No backlight after waking up from suspend. I can "see" (just barely) the sign-in dialog window, but it was very dark. This was probably only due to a reflection from the ambient light, the backlight was not turned on.
I have 11.04, 11.10, 12.04LTS, and 12.10 installed on other partitions of the same notebook. 13.04 is the only version that gives the this no-backlight problem.
I've gotten the same problem. What I did to work around this problem:
sudo gedit /etc/pm/sleep.d/00-displayfix
Copypasta the next few lines and save.
Code:
#!/bin/sh
case "$1" in
thaw|resume)
echo 500 > /sys/class/backlight/intel_backlight/brightness
;;
*)
;;
esac
exit $?
Finally, make it executable:
sudo chmod a+x /etc/pm/sleep.d/00-displayfix
The script might be a little different depending on your hardware. If it does not work, just find out the path to your backlights interface.