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CID: 201306-13641 HP Pavilion 15

Steps:
1. Install 12.04.3 + updates (3.8.0-34), boot to desktop
2. Try to adjust screen brightness by the hotkeys
3. Try to adjust screen brightness by the "Brightness and Lock" applet

Expected Results:
* Brightness could be adjusted.

Actual Results:
* The birghtness level indicator will change, but the brightness won't.

Workaround:
Install the proprietart fglrx driver, however, bug 1264259 will make both of these two bugs become blockers

Debugging information:
$ ls /sys/class/backlight
acpi_video0  acpi_video1  radeon_bl0

$ grep -r . /proc/acpi 
/proc/acpi/button/lid/LID/state:state:      open
grep: /proc/acpi/event: Permission denied
/proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
/proc/acpi/wakeup:PB5	  S5	*disabled  pci:0000:00:05.0
/proc/acpi/wakeup:XPDV	  S5	*enabled   pci:0000:03:00.0
/proc/acpi/wakeup:OHC1	  S3	*enabled   pci:0000:00:12.0
/proc/acpi/wakeup:OHC2	  S3	*enabled   pci:0000:00:13.0
/proc/acpi/wakeup:EHC1	  S3	*enabled   pci:0000:00:12.2
/proc/acpi/wakeup:EHC2	  S3	*enabled   pci:0000:00:13.2
/proc/acpi/wakeup:XHC0	  S3	*enabled   pci:0000:00:10.0
/proc/acpi/wakeup:KBC0	  S3	*enabled   pnp:00:06
/proc/acpi/wakeup:PS2M	  S3	*disabled  pnp:00:07

$ dmesg | grep 'ACPI: Video' 
[    9.618209] ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)
[    9.619751] ACPI: Video Device [VGA1] (multi-head: yes  rom: no  post: no)

$ cat /proc/version
Linux version 3.8.0-34-generic (buildd@toyol) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #49~precise1-Ubuntu SMP Wed Nov 13 18:05:00 UTC 2013

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-video-radeon-lts-raring 1:7.1.0-0ubuntu2~precise1
ProcVersionSignature: Ubuntu 3.8.0-34.49~precise1-generic 3.8.13.12
Uname: Linux 3.8.0-34-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Thu Dec 26 05:34:31 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: xserver-xorg-video-ati-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Medium
     Assignee: Alberto Milone (albertomilone)
         Status: Incomplete


** Tags: 201306-13641 amd64 apport-bug blocks-hwcert precise running-unity taipei-lab
-- 
[HP Pavilion 15] Brightness cannot be adjusted with the radeon driver
https://bugs.launchpad.net/bugs/1264272
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