Can't adjust brightness on a Sony Vaio T13 ultrabook

Posted by Alex Barreira on Ask Ubuntu See other posts from Ask Ubuntu or by Alex Barreira
Published on 2012-10-10T19:59:45Z Indexed on 2012/10/17 17:21 UTC
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Filed under:

12.04

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brightness

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vaio

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ultrabook

I recently installed Ubuntu 12.04 alongside Windows 7 in a Vaio T13 ultrabook.

I cannot use the the Fn+F4 or Fn+F5 to change the brightness. The bubble appears indicating that brightness is being changed but with no visual impact on the screen.

I've tried many solutions involving the manipulation of the /etc/default/grub file but none of them worked. Whenever I tried this manipulation the screen still didn't change, however the bubble stopped functioning properly.

This is not a problem of the Fn shortcut. Even when I try to change it in the Brightness and Lock on System Settings, the bar does scroll but the screen remains unchanged.

Does any one has a way around this mystery?

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