I also had similar problem. It was solved by reinstalling the linux
firmware drivers using synaptic

On 4/27/12, Pedro Monteiro <947...@bugs.launchpad.net> wrote:
> Now it works with fglrx drivers.
> fixed by running: sudo aticonfig --initial
> hope it helps someone
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/947748
>
> Title:
>   Brightness control not working after latest update
>
> Status in “gnome-settings-daemon” package in Ubuntu:
>   Fix Released
>
> Bug description:
>   After today's update my brightness controls aren't working anymore.
>   After checking the System Settings, Brightness and Lock there is no
>   longer any brightness slider bar shown for manual setting either. So
>   my screen is fixed on full brightness. I'll attach screen shots
>   showing the difference before and after the update.
>
>   == Regression details ==
>   Discovered in version: 3.3.91-0ubuntu1
>   Last known good version: 3.3.90-0ubuntu4
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 12.04
>   Package: gnome-settings-daemon 3.3.91-0ubuntu1
>   ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
>   Uname: Linux 3.2.0-18-generic x86_64
>   ApportVersion: 1.94-0ubuntu1
>   Architecture: amd64
>   CheckboxSubmission: dd7f729683fa7fd3f2e256ba311e86cb
>   CheckboxSystem: d00f84de8a555815fa1c4660280da308
>   Date: Mon Mar  5 21:36:12 2012
>   InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111006)
>   SourcePackage: gnome-settings-daemon
>   UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/947748/+subscriptions
>

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https://bugs.launchpad.net/bugs/947748

Title:
  Brightness control not working after latest update

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