I've gotten the same problem. What I did to work around this problem:
Originally Posted by ping-wu
Copypasta the next few lines and save.
sudo gedit /etc/pm/sleep.d/00-displayfix
Finally, make it executable:
case "$1" in
echo 500 > /sys/class/backlight/intel_backlight/brightness
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.
sudo chmod a+x /etc/pm/sleep.d/00-displayfix