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This question already has an answer here:

Asus g53 laptop, Ubuntu 14.04, KDE 4.13.3

Fn+{f5f6} should change the screen brightness but only the animation appears with the panel (I can increase the values but the brightness does no change)

  1. I have already tried to add this to grub

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
    

    Does not work.

  2. I tried this one too, I do not know what should happen after the first command but I just got back the console without anything seeming to happen:

    Brightness keyboard buttons do not work on Asus 1225c

  3. I have also installed this dkms package found on Ubuntu Forums

On GNOME and Unity this function works like a charm. Why not on KDE? Keyboard backlight is working on KDE.

marked as duplicate by Eric Carvalho, user364819, Thomas Ward Jun 13 '17 at 17:54

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In the terminal:

sudo -H gedit /etc/default/grub

Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Save, then

sudo update-grub

Restart computer.

The function keys Fn+{f5f6} should now be active.

This may need to be done again after upgrading the system, as the grub file may be modified during the upgrade procedure.

  • what device did you test this on? Doesn't work on my Asus. And it's a big hammer that might break other functions – Zanna Jun 7 '17 at 7:01

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