I have a dualscreen setup with my laptop (HP 8730w) and an external monitor, running Ubuntu 10.04. Sometimes when logging in (can be after suspending or after locking the screen), the screen brightness of the laptop is set to really low and nothing in the system (brightness applet or brightness adjustment keys) can change it. The only solution until today was logging out, making sure that the mouse was on the laptop screen and logging in again. Voila, setting returned.
Now I have another way. As root, you type the following:
# cat /proc/acpi/video/DGFX/LCD/brightness
levels: 30 37 44 51 58 65 72 79 86 93 100
current: 100
# echo -n 86 > /proc/acpi/video/DGFX/LCD/brightness
where DGFX is replaced with whatever you have available in your system.
The value after echo (here 86) is the brightness percentage you want to set. Please note, that only values that are mentioned in the levels-line are accepted.
(Thanks go to susundberg @ #ubuntu for pointing me in the correct direction.)
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