Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1276037
Title:
[Thinkpad T420s] Brightness dims when unplugging external monitor and
cannot be changed afterwards
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