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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1345499/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
