Public bug reported:

On an Esprimo Mobile U9200 running up-to-date Precise, I am no longer
able to adjust screen brightness at all. The slider in the brightness
and lock dialog does not respond, and after 10–20 seconds, it disappears
entirely (see the screenshots I've attached).

The function keys for the same purpose do not work, either. Adding
brightness with Fn+F9 only lights up the screen for a short moment. Bug
979495 seems related.

Until a couple of days ago, the keys not working were the only problem —
I was able to adjust the brightness in the dialog, even though I needed
to re-do that after every boot.

Ubuntu 12.04 (development branch)
gnome-control-center 1:3.4.0-0ubuntu7

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.0-0ubuntu7
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu3
Architecture: amd64
Date: Mon Apr 16 09:23:47 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to precise on 2011-12-25 (112 days ago)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu3
 deja-dup                            22.0-0ubuntu2
 gnome-bluetooth                     3.2.2-0ubuntu5
 indicator-datetime                  0.3.94-0ubuntu1

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/982861

Title:
  Cannot adjust screen brightness

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