Oddly, I've never experienced this issue until doing an update today. My system is a Dell XPS 13 and my kernel version is also 3.8.0-22.
Running the following command restores brightness controls for me, until returning from standby or booting.
sudo echo 0 > /sys/class/backlight/intel_backlight/brightness
Oddly, I've never experienced this issue until doing an update today. My system is a Dell XPS 13 and my kernel version is also 3.8.0-22.
Running the following command restores brightness controls for me, until returning from standby or booting.
sudo echo 0 > /sys/class/ backlight/ intel_backlight /brightness