I have laptop asus k501ux, just installed ubuntu and it seems every key works except brightness controls, in my case it is Fn+F5 (up) and F6(down). any idea why is that happening and how to fix it?

  • Possible duplicate of Change brightness – wjandrea Jul 30 '16 at 17:34
  • @wjandrea It is not a duplicate of that question. – Pilot6 Jul 30 '16 at 17:36
  • @Pilot6 How is it different? – wjandrea Jul 30 '16 at 17:37
  • The laptop is different and the solution is different. Absolutely not related. – Pilot6 Jul 30 '16 at 17:38
  • 1
    Anyway acpi_osi= is needed for this laptop. – Pilot6 Jul 30 '16 at 17:42
  1. Go to the terminal and open grub file

sudo gedit /etc/default/grub

  1. Find


and change to this

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=native acpi_osi="

  1. Update grub

sudo update-grub

  1. Restart and it's done

That worked on Asus k501ux laptop

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    If my answer was helpful, you can accept it by clicking the check sign at the left of it, instead of editing in that it worked. @Giorgi Khmaladze – Pilot6 Jul 30 '16 at 17:35
  • I will check the acpi_backlight=native. It is a new param. – Pilot6 Jul 30 '16 at 17:42
  • This worked for me in Asus N501VW and Ubuntu 16.04. Thanks man :) – Jitu Aug 26 '16 at 11:24
  • This is not sufficient in Asus Zenbook UX303UA, for instance, see if the problem still persists askubuntu.com/q/816264/25388 – Léo Léopold Hertz 준영 Aug 29 '16 at 20:05

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