I installed Ubuntu 20.04 on my ASUS ROG Zephyrus G15. I am not able to use the following keyboard action keys shortcuts(Fn+Function keys):

  1. Screen brightness(Up:Fn+F7 / Down:Fn+F8)
  2. Keyboard backlight(Fn+Up Arrow Key)
  3. Microphone mute(Dedicated button)
  4. Sleep(Fn+F11)
  5. Aeroplane mode(Fn+F12)
  6. Touchpad deactivate/activate button(Fn+F10)

Edit: I already tried adding acpi_osi= and later acpi_osi=linux after quiet splash in /boot/grub/grub.cfg, but no luck, the laptop would just hang with a blank screen after showing the boot logo.

If the solution is not available, how do I code it myself to make it work, please give me some pointers. Thank you.

  • find out how to issue those commands in a terminal and then make a Ubuntu shortcut key to make them work . it might require a script for instance to increment screen brightness and not go over the max value eg sudo tee /sys/class/backlight/amdgpu_bl0/brightness .... cd /sys/class/backlight/amdgpu_bl0$ cat brightness ;cat max_brightness ; cat actual_brightness
    – pierrely
    Mar 20, 2021 at 5:20
  • I went to this directory /sys/class/backlight/amdgpu_bl0/brightness. and found that the files you mentioned were there. But when I did $ sudo 52 >> actual_brightness and $ sudo 52 >> brightness, the brightness didn't change, and also permission denied message showed up. Any pointers, or can you tell what i am doing wrong?
    – Aswath
    Mar 20, 2021 at 7:46

1 Answer 1


I figured it out, I came across this asus-linux.org website and that had the solution. I just had to update my kernel to the latest version(5.11 as of now). I installed the latest kernel with Mainline kernel updater software.

The screen brightness and the keyboard backlight Function keys are working now. And some other bugs were solved.

  • in my machine ROG G531GD, after installing stable kernel 5.11 for ubuntu 20.04, when reboot will face error "need to load kernel first". To fix: on BIOS disable secure boot and/or fast boot. Jan 3 at 14:45

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