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[Bug 1181927] Re: 13.04: Brightness control visible but does nothing

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** Description changed:

- Description:	Ubuntu 13.04
- Release:	13.04
- 
- linux-image-generic:
-   Installed: 3.8.0.21.37
-   Candidate: 3.8.0.21.37
-   Version table:
-  *** 3.8.0.21.37 0
-         500 http://ubuntu-archive.sit.kmutt.ac.th/ raring-updates/main amd64 Packages
-         500 http://ubuntu-archive.sit.kmutt.ac.th/ raring-security/main amd64 Packages
-         100 /var/lib/dpkg/status
-      3.8.0.19.35 0
-         500 http://ubuntu-archive.sit.kmutt.ac.th/ raring/main amd64 Packages
- 
  Brightness control visible but does nothing on 13.04...
  
  The brightness up down buttons shows the overlay brightness icon going
  up and down but it does not change the brightness (backlight).
  
  I have tried adjusting the kernel options acpi_osi=<x> and
  acpi_backlight=<y> (that did work with 12.10) to make it work but to no
  avail.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-generic 3.8.0.21.37
  ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
  Uname: Linux 3.8.0-21-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  thomasc    2007 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  thomasc    2007 F.... pulseaudio
  Date: Mon May 20 12:45:35 2013
  HibernationDevice: RESUME=UUID=2acc4a8c-a645-4f3c-bc8e-5c7a9d9df417
  InstallationDate: Installed on 2013-04-11 (38 days ago)
  InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Alpha amd64 (20130410)
  MachineType: Acer Aspire V5-431
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-21-generic root=UUID=4cfdb2ed-677a-4fd0-aa7d-5b118700bd35 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.8.0-21-generic N/A
-  linux-backports-modules-3.8.0-21-generic  N/A
-  linux-firmware                            1.106
+  linux-restricted-modules-3.8.0-21-generic N/A
+  linux-backports-modules-3.8.0-21-generic  N/A
+  linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/12/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: V1.20
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire V5-431
  dmi.board.vendor: Acer
  dmi.board.version: V1.20
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.20
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.20:bd12/12/2012:svnAcer:pnAspireV5-431:pvrV1.20:rvnAcer:rnAspireV5-431:rvrV1.20:cvnAcer:ct9:cvrV1.20:
  dmi.product.name: Aspire V5-431
  dmi.product.version: V1.20
  dmi.sys.vendor: Acer

-- 
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https://bugs.launchpad.net/bugs/1181927

Title:
  13.04: Brightness control visible but does nothing

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Brightness control visible but does nothing on 13.04...

  The brightness up down buttons shows the overlay brightness icon going
  up and down but it does not change the brightness (backlight).

  I have tried adjusting the kernel options acpi_osi=<x> and
  acpi_backlight=<y> (that did work with 12.10) to make it work but to
  no avail.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-generic 3.8.0.21.37
  ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
  Uname: Linux 3.8.0-21-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  thomasc    2007 F.... pulseaudio
  Date: Mon May 20 12:45:35 2013
  HibernationDevice: RESUME=UUID=2acc4a8c-a645-4f3c-bc8e-5c7a9d9df417
  InstallationDate: Installed on 2013-04-11 (38 days ago)
  InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Alpha amd64 (20130410)
  MachineType: Acer Aspire V5-431
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-21-generic root=UUID=4cfdb2ed-677a-4fd0-aa7d-5b118700bd35 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-21-generic N/A
   linux-backports-modules-3.8.0-21-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/12/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: V1.20
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire V5-431
  dmi.board.vendor: Acer
  dmi.board.version: V1.20
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.20
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.20:bd12/12/2012:svnAcer:pnAspireV5-431:pvrV1.20:rvnAcer:rnAspireV5-431:rvrV1.20:cvnAcer:ct9:cvrV1.20:
  dmi.product.name: Aspire V5-431
  dmi.product.version: V1.20
  dmi.sys.vendor: Acer

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