I just installed Precise on my Samsung Laptop (QX412-S01au, using Ubuntu 2D). The brightness hotkeys sort of work:

• Adjusting the brightness using the slider in the control panel works just fine


• Pressing the brightness keys brings up the brightness notification


• Pressing "Up" raises the brightness to maximum, no matter what it was before


• Pressing "Down" lowers the brightness to one step below maximum, no matter what it was before.

Another answer I looked (can't find the link, sorry) got my to try this:

echo "0" | sudo tee /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness

which takes the brightness to the lowest setting. And

echo "7" | sudo tee /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness

which takes the brightness to the highest setting. Each step inbetween works too.

Between that and the control panel working, I think the drivers are fine. Any idea why the hotkeys (and only the hotkeys) seem to get stuck on the top two brightness settings?

p.s. Happy to hit up the command line to make it work :)