Comment 69 for bug 1348890

Michael Weimann (m982) wrote :

For me it is working with:

• Add "acpi_osi=" to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub then run update-grub
• Add a file "20-backlight.conf" with the following content to "/usr/share/X11/xorg.conf.d"
Section "Device"
    Identifier "card0"
    Driver "intel"
    Option "Backlight" "intel_backlight"
    BusID "PCI:0:2:0"
EndSection

After a reboot it's working.

Asus Zenbook UX305UA running Ubuntu 15.10 with 4.4 kernel.