Asus X401A Fn keys not controlling screen brightness
Having installed Linux Mint 14 on the Asus X401A, I found the Fn keys for controlling screen brightness Fn-F5 and Fn-F6 do not work.
In a terminal session:
gksudo pluma /etc/default/grub
"quiet splash" to
"quiet splash acpi_osi=" thus:
GRUB_CMDLINE_LINUX_DEFAULT= "quiet splash acpi_osi="
Save the file then:
Reboot and the Fn keys will set the brightness.
Sadly, this seems to have broken Fn-F2 which switches the WiFi on/off.