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I am having problem with Ubuntu 13.10 brightness control. My brightness shortcut keys (Fn + F5/F6) worked in 12.10 and 13.04 but they have stopped working in 13.10.

I am using Sony Vaio SVE15113ENB with VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09). Any help is appreciated.

I have tried following options, but none of them has worked so far:

  1. Installing Additional Drivers from Software Centre
  2. Finding /etc/X11/Xorg.con file for editing but it does not exist for me.
  3. Visited Software & Updates > Additional Drivers tab, but it shows nothing saying 'No additional drivers available' and 'No proprietary drivers are in use'.

Thanks in advance for any help.

Ninad
  • 386

1 Answers1

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Try this.

  • Execute $ sudo gedit /etc/default/grub

  • Modify the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

  • Save the changes.

  • Execute $ sudo update-grub

  • Reboot.

Archlinux Wiki on brightness controls here.

Ninad
  • 386
Pavel
  • 1,456
  • Thanks @Pavel for your response. I tried this approach, with an additional reference to another similar question http://askubuntu.com/questions/366710/i-cant-modify-the-screen-brightness-on-xubuntu-13-10 – Ninad Nov 13 '13 at 09:36
  • But it did not work. Is there anything I could check with driver installations? Or does Ubuntu installation come packaged with sufficient drivers to make all standard features of a laptop work out-of-box? – Ninad Nov 13 '13 at 09:43
  • Your laptop may need some more tweaking as mentioned on this Arch wiki page in the ACPI section: https://wiki.archlinux.org/index.php/backlight. Try it. – Pavel Nov 13 '13 at 14:35
  • I am able to set brightness from Terminal using commands echo 4000 | sudo tee /sys/class/backlight/intel_backlight/brightness and cat /sys/class/backlight/intel_backlight/brightness. Could you suggest a way to trigger them using Fn+F5 or Fn+F6? – Ninad Nov 13 '13 at 19:38
  • Before we reach there: have you tried ALL grub file options from the Arch manual? And can you change brightness from System Settings > Brightness & Lock? – Pavel Nov 13 '13 at 21:07
  • Yes @Pavel I tried all combinations of acpi_osi="!Windows 2012" acpi_backlight=vendor , acpi_backlight=legacy and acpi_osi=Linux but I am not able to make it work. – Ninad Nov 13 '13 at 22:03
  • I am not able to change brightness from Brightness & Lock application. – Ninad Nov 13 '13 at 22:05
  • You can check this entry for assigning keys to backlight function. You'll probably need to install xbacklight to do it: http://askubuntu.com/questions/273045/how-to-use-xbacklight-with-brightness-keys-in-a-vaio. But I'm puzzled that controls work via terminal but not via the Brightness & Lock applet. Such scenario not even mentioned in debugging manuals. – Pavel Nov 14 '13 at 07:49
  • let us continue this discussion in chat – Ninad Nov 14 '13 at 13:31