Thanks for testing and the update. That is good news that the bug is fixed in 3.14-rc1. Can you also test the latest 3.13 stable kernel, which is 3.13.1? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.1-trusty/ That is the kernel currently in -proposed. So if the bug is fixed there, it will land in Trusty shortly. If the bug is not fixed in 3.13.1, we can perform a reverse bisect to identify the fix in 3.14-rc1. -- 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/1276037 Title: [Thinkpad T420s] Brightness dims when unplugging external monitor and cannot be changed afterwards Status in “linux” package in Ubuntu: Confirmed Bug description: Steps to reproduce 1) Plug a T420s to an external monitor using Displayport 2) Both external and internal monitor look right 3) Unplug (via software or hardware) the external monitor Expected results: The brightness in the internal monitor stays the same and it can be changed through system keys or system settings Actual results: The brightness in the internal monitor dims and it cannot be changed until the system is rebooted ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-6-generic 3.13.0-6.23 ProcVersionSignature: Ubuntu 3.13.0-6.23-generic 3.13.0 Uname: Linux 3.13.0-6-generic x86_64 ApportVersion: 2.13.2-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ara 2409 F.... pulseaudio CurrentDesktop: Unity Date: Tue Feb 4 09:06:02 2014 HibernationDevice: RESUME=UUID=85ebfa4c-a925-4edf-9764-79ecfaa29ae6 InstallationDate: Installed on 2013-06-17 (231 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: LENOVO 4171CTO ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-6-generic root=UUID=35693a74-fe03-4399-920c-24bfaf0a5649 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-6-generic N/A linux-backports-modules-3.13.0-6-generic N/A linux-firmware 1.123 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-01-20 (14 days ago) dmi.bios.date: 07/11/2012 dmi.bios.vendor: LENOVO dmi.bios.version: 8CET54WW (1.34 ) dmi.board.asset.tag: Not Available dmi.board.name: 4171CTO dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr8CET54WW(1.34):bd07/11/2012:svnLENOVO:pn4171CTO:pvrThinkPadT420s:rvnLENOVO:rn4171CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4171CTO dmi.product.version: ThinkPad T420s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1276037/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
