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The brightness function keys on my Asus laptop don't work on Ubuntu. The function key combinations for sound volume (Fn+F12/F11/F10) and turning the screen on and off (Fn+F7), but not those that should adjust the brightness (Fn+F6/F5)...

After some, I tried this itsfoss.com article, but it still doesn't work.

I tried Brightness fn key shortcut doesn't work on ASUS laptop but again no success.

What else can I try?

Zanna
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FrogSkyWater
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1 Answers1

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OP's answer removed from the question and edited slightly:

I found the solution on this webpage (in French).

It tells us to 

sudo -H gedit /etc/default/grub

then find this line 

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

and add a parameters acpi_osi= and acpi_backlight=intel, so the edited line reads:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi= acpi_backlight=intel"

save the file, and then to make changes effective, run

sudo update-grub

finally you turn off / restart your monster and it should work!!*

I should mention that I still have the /usr/share/X11/xorg.conf.d/20-intel.conf file as described in the first article I linked to in my question.**

* CW post author's note: You may want to try the boot parameters individually first, rather than together. acpi_backlight=intel should be tried alone first as it has less wide-ranging effects. Don't forget to run sudo update-grub after each change made to /etc/default/grub and then reboot to see if it has been effective.

** CW post author's note 2: my own experience (and the fact that it didn't work for OP earlier) strongly indicates that this file did not do anything good. If you are following this answer, I recommend you do not try to create this file in combination with the edit to /etc/default/grub, unless that method did not work, and the 20-intel.conf solution did not work when tried separately.

Zanna
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