Marius Gedminas, this bug report is being closed due to your last
comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1378863/comments/8
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
the yellow line and then choosing a new status in the revealed drop down
box. You can learn more about bug statuses at
https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time
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future bugs you may find.
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1378863
Title:
ThinkPad X220: unplugging DisplayPort breaks backlight (intel video)
Status in “linux” package in Ubuntu:
Invalid
Bug description:
Steps to reproduce:
1. Plug in an external monitor using a DisplayPort -> HDMI cable
2. Unplug the cable
What happens about 30% of the time:
- Brightness of laptop's internal LCD drops to lowest level
- Brightness keys (Fn-Home/End on this Lenovo ThinkPad X220) produce the
gnome-shell on-screen display of the changing brightness meter, but actual LCD
brightness doesn't change.
There are a couple of workarounds:
1. Ctrl+Alt+F1 and use Fn-Home/End to control brightness, then
Ctrl+Alt+F7 back to X (where brightness keys continue to not work)
or
2. Plug/unplug DisplayPort again, this usually fixes the brigthness
(maybe 60% of the time)
I've been having this problem on this laptop since January of 2014. I was
running Ubuntu 13.10 then, I'm running 14.04 now.
Sometimes the brightness-drop-and-you-can't-fix-it thing happens on
DisplayPort hotplug rather than on unplug.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-37-generic 3.13.0-37.64
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mg 3318 F.... pulseaudio
CurrentDesktop: GNOME
Date: Wed Oct 8 17:35:50 2014
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=bf592a79-5f4e-486d-b69d-7525d492dcc6
InstallationDate: Installed on 2012-07-25 (805 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
Lsusb:
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 4291WJF
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic
root=UUID=36079681-53fc-4ca2-80ac-98321c07e8d2 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-37-generic N/A
linux-backports-modules-3.13.0-37-generic N/A
linux-firmware 1.127.7
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-04-18 (173 days ago)
dmi.bios.date: 07/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET69WW (1.39 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4291WJF
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:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4291WJF
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
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