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CID: 201304-13196 Dell Inspiron 5537

Unable to adjust the screen brightness on this system.
Tested with 3.8.0-29 and 3.8.0-30 kernel.

Step:
1. Install 12.04.3 and boot to desktop.
2. Try to adjust brightness with the brightness keys.
2. Try to adjust brightness in "Brightness and Lock" of System settings.

Expected result:
Brightness could be adjusted by using the brightness keys and by adjusting in "Brightness and Lock" of System settings.

Actual result:
1. Brightness keys events (keycode 224/225) were captured, but the brightness cannot be adjusted. Brightness level indiciator only changes between Max and Max - 1
2. Brightness cannot be adjusted in "Brightness and Lock" of System settings.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-30-generic 3.8.0-30.44~precise1
ProcVersionSignature: Ubuntu 3.8.0-30.44~precise1-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
Date: Thu Sep 26 03:22:41 2013
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Anthony Wong (anthonywong)
         Status: New


** Tags: 201304-13196 amd64 apport-bug blocks-hwcert blocks-hwcert-enablement precise running-unity taipei-lab
-- 
Unable to adjust screenbrightness with Intel Haswell-ULT Integrated Graphics Controller [8086:0a26]
https://bugs.launchpad.net/bugs/1231305
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