kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

jdillmann, please execute the following in a terminal:
apport-collect 1345499

** Description changed:

- As requested by https://launchpad.net/~penalvch in the existing
- bugreport https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1308674 i
- provide more information about the bug.
+ The brightness control on the Lenovo ThinkPad x220 is no longer working
+ after undocking. It is stuck an the lowest level and can't by changed
+ with the hotkeys. There is /sys/class/backlight/acpi_video0/ which has
+ no effect. The bug occurs when using kernel 3.13 on 12.04 and on 14.04.
  
- As explained in the original bug  report, the brightness control on the
- lenovo thinkpad x220 is no longer working after undocking. it is stuck
- an the lowest level and can't by changed with the hotkeys.
- 
- But it is still possible to set the brightness through /sys/class/backlight/intel_backlight/
+ WORKAROUND: Set the brightness through /sys/class/backlight/intel_backlight/
  The hotkeys are working again after setting the brightness once on the command line.
- 
- Besides intel_backlight there is /sys/class/backlight/acpi_video0/ which
- has no effect.
- 
- The bug occurs when using kernel 3.13 on 12.04 and on 14.04
- 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55~precise1
  ProcVersionSignature: Ubuntu 3.13.0-30.55~precise1-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Sun Jul 20 09:39:01 2014
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)

** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

-- 
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https://bugs.launchpad.net/bugs/1345499

Title:
  [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken
  when going from docked -> undocked

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The brightness control on the Lenovo ThinkPad x220 is no longer
  working after undocking. It is stuck an the lowest level and can't by
  changed with the hotkeys. There is /sys/class/backlight/acpi_video0/
  which has no effect. The bug occurs when using kernel 3.13 on 12.04
  and on 14.04.

  WORKAROUND: Set the brightness through /sys/class/backlight/intel_backlight/
  The hotkeys are working again after setting the brightness once on the command line.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55~precise1
  ProcVersionSignature: Ubuntu 3.13.0-30.55~precise1-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Sun Jul 20 09:39:01 2014
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)

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