Ubuntu – Brightness function keys not working

12.10brightnessfunction keyslaptop

I have an ASUS X55A-SPD0204O laptop. The rest of the FN+Fx (where x = number) like sound + – mute, screen turn off, wireless etc. work perfectly.

The problem is with the 2 brightness keys. They just won't work. Any suggestions?

Best Answer

Try adding acpi_backlight=vendor as a boot option. To do that, open a terminal window, and run

gksu gedit /etc/default/grub

Locate this line: GRUB_CMDLINE_LINUX="".

Edit it to look like this: GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

Save the file, then, in a terminal, run sudo update-grub.

Reboot, and check if the brightness keys work.