where is the backlight dimmer?

[Mike]

I understand, however I am trying to diagnose if this is X server or hardware related. If you don't mind, please run xbacklight -set 50 to reduce the backlight. If it works, simply run xbacklight -set 100 to set it back to 100%.

Please also post the results of this command:

Code:

for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done