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Message #90773
[Bug 1391153] Re: Thnikpad X220 - brightness control doesn't work
narel, could you please test the latest upstream kernel available from
the very top line at the top of the page (the release names are
irrelevant for testing, and please do not test the daily folder)
following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow
additional upstream developers to examine the issue.
If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER
where VERSION-NUMBER is the version number of the kernel you tested exactly shown as:
kernel-fixed-upstream-3.18-rc5
This can be done by clicking on the yellow circle with a black pencil
icon next to the word Tags located at the bottom of the bug description.
If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER
Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.
** Tags removed: bios-outdated-1.39
** Tags added: latest-bios-1.39
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1391153
Title:
Thnikpad X220 - brightness control doesn't work
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
After upgrading to Ubuntu 14.10 brightness control no longer works on
Lenovo Thinkpad X220. Fn+Home/Fn+End doesn't work, the only way is to
echo value to:
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/brightness
I use Awesome WM, but it doesn't seem to be related to Awesome.
---
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: narel 3706 F...m pulseaudio
/dev/snd/controlC0: narel 3706 F.... pulseaudio
DistroRelease: Ubuntu 14.10
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=0f22933e-6234-43cf-8687-1245585a3025
InstallationDate: Installed on 2014-01-03 (318 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO 4290PB8
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic root=/dev/mapper/ubuntu--vg-root ro acpi_backlight=vendor quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
RelatedPackageVersions:
linux-restricted-modules-3.16.0-24-generic N/A
linux-backports-modules-3.16.0-24-generic N/A
linux-firmware 1.138
Tags: utopic
Uname: Linux 3.16.0-24-generic x86_64
UpgradeStatus: Upgraded to utopic on 2014-11-07 (10 days ago)
UserGroups: adm audio cdrom dialout dip libvirtd lpadmin plugdev pulse pulse-access remote sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/19/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET63WW (1.33 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4290PB8
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:bvr8DET63WW(1.33):bd07/19/2012:svnLENOVO:pn4290PB8:pvrThinkPadX220:rvnLENOVO:rn4290PB8:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4290PB8
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
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