Comment 25 for bug 1348890

Zechariah Jibben (threeofsix) wrote :

I can also confirm the bug on Ubuntu 14.10 on ASUS UX303LAB.

$ sudo dmidecode -s bios-version
$ uname -a
Linux UX303 3.16.0-33-generic #44-Ubuntu SMP Thu Mar 12 12:19:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

A possible workaround:

I have screen brightness control through the system settings, but not through the Fn+F-keys. This works if acpi_osi=intel is in the boot parameters, or there is no "acpi_osi" mentioned. For example, only "quiet splash". If you install xbacklight from the Ubuntu repositories, the commands

$ xbacklight -dec 12.5
$ xbacklight -inc 12.5

decrease and increase (respectively) the screen brightness by 12.5% (I picked 1/8th total, but another choice will do). So, in keyboard settings I mapped these commands to Alt+F5 and Alt+F6, which seems ok so far. Hopefully this will make things easier until a fix comes out.