2 hours ago
On Lenovo T520 combination Fn + Home/End for increasing/decreasing screen brightness works perfectly out-of-box but with the step = 3. It's too coarse (HW values are 0..15).
Fn + Home/End
step = 3
How to change the step to 1?
21 hours ago
One way to change the brightness to individual settings is to use your console. So open a terminal (e.g. gnome-terminal) and:
sudo find /sys /proc -name brightness
lsmod | grep video
video 18612 0
echo $somenumber | sudo tee $DIR
26 hours ago
on my T520i, Ubuntu 12.04, it's found in /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness, and it changes brightness but we still need the finer step on the keyboard shortcut :(