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Brightness should be controlled by pressing Fn + F5 and Fn + F6. Nothing happens when I press these keys. My computer is a Asus X551MAV­-SX366GB and I'm using Lubuntu 14.04

snoop
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Carsten
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  • This is a known issue with Asus laptops. This post helped me: http://askubuntu.com/questions/489247/14-04-asus-g56jr-fn-brightness-control (I assigned another keyboard shortcut for xbacklight). – Takkat Oct 25 '14 at 19:43
  • Not working for me :-( – Carsten Oct 26 '14 at 08:39
  • Well, I can now adjust brightness in the system settings, but not through fn keys. – Carsten Nov 04 '14 at 18:53
  • After changing this in my /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" I now kan use the Fn keys :-) It still starts out with full brightness. Are there any way to make the computer start up on a lower brightness level? E.g. like the one I left it with? – Carsten Nov 08 '14 at 13:42
  • xbacklight was not installed, so I had to install it first. It seems to word fine :-) – Carsten Nov 09 '14 at 07:55
  • Here is the summary of what I did: I created the file /usr/share/X11/xorg.conf.d/20-intel.conf as described here link. Then I changed /etc/default/grub as described above and ran "update-grub" from the command line. And at last I did the xbacklight thing. – Carsten Nov 09 '14 at 08:11
  • Have done that now, if that was what you meant... – Carsten Nov 09 '14 at 11:31
  • Yeah exactly :) Great job - I prettified it a bit so that people who come here can get it all at a glance (if you did something else, please edit/add it there!). Oh and I deleted all coments here for cleanup. – Takkat Nov 09 '14 at 11:47

1 Answers1

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Here is the summary of what I did:

  1. I created the file /usr/share/X11/xorg.conf.d/20-intel.conf as described here 13.10 Can't Adjust Dell Laptop Backlight:

    Section "Device"
     Identifier  "card0"
     Driver      "intel"
     Option      "Backlight"  "intel_backlight"
     BusID       "PCI:0:2:0"
EndSection

  2. Then I changed one line in/etc/default/grub so it looked like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" and ransudo update-grub` from the command line.

  3. Install xbacklight Install xbacklight if not already installed sudo apt-get install xbacklight. Then I put xbacklight -set 50 to autostart applications.

  4. Reboot

This worked for me.

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Carsten
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  • Hmmmm. Not working with Xubuntu on the same machine :-( I see the indicator, when I press function keys, but nothing happens. – Carsten Dec 23 '14 at 08:17