[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1388817
Title:
Backlight brightness problem with Thinkpad T440S
Status in linux package in Ubuntu:
Expired
Bug description:
The brightness can't be adjusted smoothly. Only 4 brightnesses can be
achieved with Fn keys.
WORKAROUND: I add "acpi_backlight=vendor" kernel parameter according
to https://wiki.ubuntu.com/Kernel/Debugging/Backlight.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-39-generic 3.13.0-39.66
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jing 2280 F.... pulseaudio
/dev/snd/controlC1: jing 2280 F.... pulseaudio
/dev/snd/pcmC1D0p: jing 2280 F...m pulseaudio
CurrentDesktop: Unity
Date: Mon Nov 3 20:51:08 2014
HibernationDevice: RESUME=UUID=4bfed795-9c38-418e-b097-83b17523308e
InstallationDate: Installed on 2014-06-28 (128 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 20AQA02QHH
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-39-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi_backlight=vendor
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-39-generic N/A
linux-backports-modules-3.13.0-39-generic N/A
linux-firmware 1.127.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/21/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET72WW (2.22 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20AQA02QHH
dmi.board.vendor: LENOVO
dmi.board.version: 0B98405 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrGJET72WW(2.22):bd02/21/2014:svnLENOVO:pn20AQA02QHH:pvrThinkPadT440s:rvnLENOVO:rn20AQA02QHH:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20AQA02QHH
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO
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