0

I have installed Ubuntu 14.04 on my ASUS X555L Laptop using an nVidia GeForce 520M Graphics card. The fn+f5/f6 keys are unable to adjust brightness. Currently my screen brightness level is maximum. My grub file looks like this :

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0 
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

Also I tried installing XBacklight but that doesn't fix this problem .

I will be highly grateful if someone could help me with this...

Fabby
  • 34,259
chatzz
  • 1
  • check my answer here: http://askubuntu.com/questions/637155/sony-vaio-fn-keys-not-working/637167#637167 – RiddleMeThis Jun 30 '15 at 06:10
  • 1
    So your line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" looks like: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" – RiddleMeThis Jun 30 '15 at 06:11
  • @MiHa Thanks for your reply.. I tried what you suggested in your answer. My screen brightness faded but still the fn keys don't work in acpi_listen let me inform you that all other fn keys are working in acpi+listen .... What should I do now????? Thanks – chatzz Jun 30 '15 at 06:50
  • @MiHa Grub file after changes : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi= " GRUB_CMDLINE_LINUX="acpi_backlight=vendor" – chatzz Jun 30 '15 at 06:52
  • Check this answer of mine, which is more comprehensive and it includes all my steps, which I had to take and try to make Brightness work on my Asus notebook: http://askubuntu.com/questions/476664/cannot-change-backlight-brightness-ubuntu-14-04/630660#630660 – RiddleMeThis Jun 30 '15 at 16:03
  • 2
    Possible duplicate of Brightness fn key shortcut doesn't work on ASUS laptop – iegik Aug 06 '16 at 12:24

1 Answers1

0

For ASUS laptops the string must be

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Then run sudo update-grub.

This will create events for Fn buttons.

Pilot6
  • 90,100
  • 91
  • 213
  • 324
  • Thank you very much.. I tried your solution but still not working acpi_listen would still listen only other fn keys except the brightness buttons.. I have a question Can I try editing the xorg.conf file in etc/x11 folder... Will that help???? Thanks.... – chatzz Jun 30 '15 at 09:40
  • It will not help if there are no key events. – Pilot6 Jun 30 '15 at 09:59
  • well that's exactly what I've suggested in comment :) – RiddleMeThis Jun 30 '15 at 15:46