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I've recently installed Ubuntu 14.04.2 LTS on my ASUS GL552JX. The one that always bugs me is the Fn+F# button functionality.

This time, all Fn+F# button combinations work except for Fn+F5 (brightness down) and Fn+F6 (brightness up). I've tried some solution from the internet such as changing the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

inside /etc/default/grub to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

or

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi='!Windows 2012'"

or

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

and other solution such as adding:

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
    BusID       "PCI:0:2:0"
EndSection

into /usr/share/X11/xorg.conf.d/20-intel.conf, but no option works.

Current condition:

  • I can change brightness via brightness slider in System Settings > Brightness & Lock.
  • I've installed bumblebee and nvidia driver (GL552JX has Intel HD and Nvidia GPU). But I haven't activated the Nvidia card yet.

Any help?

sokokaleb
  • 33

1 Answers1

0

This must be fixed in 3.19 kernel.

  1. Install 3.19 kernel by sudo apt-get install linux-generic-lts-vivid.

  2. Reboot

If keys do not work, add acpi_osi= option and 20-intel.conf file

There was a kernel version with regression, where that kernel option did not work. But on current 3.19.0-18 it should work.

The problem is that kernel developers tried to do it that way that conf file had not been needed. But they did it with a regression for some Asus models. Now it should be fixed. But am not quite sure that correct patches reached all Ubuntu kernels.

So this issue is "in process", but workarounds should work in most cases.

Pilot6
  • 92,041