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I am using ASUS X550J. All my fn functions are working fine(volume, touchpad,...) except brightness control(fn+f5/f6).

How can I fix this?

  • Depends on your graphics card , can you identify your graphics card please. – Panther Mar 1 '17 at 16:57
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Run in a terminal

sudo -H gedit /etc/default/grub

And change the line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=!"

Save the file, run

sudo update-grub

and reboot.

This will enable the Fn+F5 and F6 keys and also lid close/open events.

You may also need to redirect to intel_backlight in X11 settings.

It can be done by adding /usr/share/X11/xorg.conf.d/20-intel.conf with this content:

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
    BusID       "PCI:0:2:0"
EndSection
  • I bought this laptop yesterday )) – Pilot6 Mar 1 '17 at 17:00

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