Ubuntu 12.04 - Unable to change brightness

Posted by Raymond Standen on Ask Ubuntu See other posts from Ask Ubuntu or by Raymond Standen
Published on 2012-06-23T11:01:52Z Indexed on 2012/07/11 15:23 UTC
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12.04

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xorg

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brightness

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toshiba-satellite

So, as a number of users seem to be experiencing, I am unable to change brightness on my laptop. Using the Brightness and Lock in settings, the slider moves but brightness does not adjust. The fn keys work for volume but not for brightness. I have updated my drivers and installed all updates, however the brightness is still at maximum.

I have heard that opening sudo gedit /etc/x11/xorg.conf and entering Option "RegistryDwords" "EnableBrightnessControl=1" can fix this, however when opening xorg.conf through Terminal I am greeted with a blank document... Not very reassuring.

Toshiba L750 Laptop

Nvidia Graphics Card

Dual boot with Windows

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