On Lenovo Thinkpad Edge E330, the screen backlight flickers badly.
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
Behavior is the same on Ubuntu 14.04 -- 15.04.
Steps were taken according to this: https:/
With acpi_backlight=
However,
echo 8 > /sys/class/
dims the screen.
thinkpad-
Old workaround: If no changes are made to boot options, and
echo 4437 > /sys/class/
is done, the flicker stops and the GUI control / acpi_video0 works, but causes flicker again.
Workaround 2: Kernel parameters: "thinkpad-
Issue: the intel_backlight device should be used, the workaround above disables the other devices, leaving only one, thus no conflicts occur.
Attaching the necessary files.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.19.0-26-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: Unity
Date: Thu Aug 20 11:21:39 2015
HibernationDevice: RESUME=
InstallationDate: Installed on 2014-08-22 (363 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: LENOVO 3354DGG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-08-20 (0 days ago)
dmi.bios.date: 02/25/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: H3ET72WW(1.09)
dmi.board.
dmi.board.name: 3354DGG
dmi.board.vendor: LENOVO
dmi.board.version: 0B98409 Std
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 3354DGG
dmi.product.
dmi.sys.vendor: LENOVO
description: | updated |
description: | updated |
description: | updated |
tags: | added: bios-outdated-1.12 |
tags: | added: bios-outdated-1.12 |
description: | updated |
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