Brightness control on Lenovo ThinkPad T430 does not work.
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Medium
|
Seth Forshee | ||
Raring |
Fix Released
|
Undecided
|
Unassigned | ||
Saucy |
Fix Released
|
Medium
|
Seth Forshee |
Bug Description
== Raring SRU Justification ==
Impact: A bug in the ACPI tables causes the ACPI backlight interface to fail to apply brightness changes with kernels claiming Windows 8 compatibility. This interface is generally the first choice of userspace, and users are unable to adjust the brightness using GUI tools.
Fix: Quirk the affected model to disable Windows 8 compatibility. This causes the AML to fall back to the pre-Win8 behavior, which functions correctly.
Test case: Verify on an affected machine. Verified on LP #1183856.
---
FN-Keys don't work for me on my ThinkPad T430.
When i'm on battery mode the screen does not dim down to save power, even not with the workaround.
The problem exists since the release of Ubuntu 13.04
My actual Kernel: 3.8.0-22-generic
For the T430s the problem seems to be fixed: https:/
WORKAROUND:
Add to /etc/default/grub
in the variable "GRUB_CMDLINE_
acpi_osi=\"!Windows 2012\"
e.g:
GRUB_CMDLINE_
Then run "sudo update-grub".
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.8.0-22-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
/dev/snd/
Date: Fri May 24 17:05:25 2013
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-05-22 (1 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: LENOVO 2349D17
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/22/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G1ET94WW (2.54 )
dmi.board.
dmi.board.name: 2349D17
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 2349D17
dmi.product.
dmi.sys.vendor: LENOVO
Related branches
CVE References
summary: |
- Brightness control on Lenovo T430 does not work. + Brightness control on Lenovo ThinkPadT430 does not work. |
description: | updated |
summary: |
- Brightness control on Lenovo ThinkPadT430 does not work. + Brightness control on Lenovo ThinkPad T430 does not work. |
tags: | added: regression-update |
description: | updated |
Changed in linux (Ubuntu): | |
assignee: | nobody → Seth Forshee (sforshee) |
status: | Incomplete → In Progress |
description: | updated |
Changed in linux (Ubuntu Saucy): | |
status: | Fix Released → Fix Committed |
Changed in linux (Ubuntu Raring): | |
status: | New → Fix Committed |
status: | Fix Committed → Fix Released |
This change was made by a bot.