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-3.13.0-30-generic 3.13.0-30.54
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: yaiza 2214 F.... pulseaudio
/dev/snd/pcmC0D0p: yaiza 2214 F...m pulseaudio
CurrentDesktop: Unity
Date: Tue Jul 15 11:50:50 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-05-05 (71 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 4171CTO
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic.efi.signed
root=UUID=62b47b3b-711a-4ea1-bae0-a59dc3eaaff1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-30-generic N/A
linux-backports-modules-3.13.0-30-generic N/A
linux-firmware 1.127.4
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
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: Confirmed
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1342053
Title:
[Thinkpad T420s] Brightness dims when unplugging external monitor and
cannot be changed afterwards
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