== 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://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098216
WORKAROUND:
Add to /etc/default/grub
in the variable "GRUB_CMDLINE_LINUX_DEFAULT":
acpi_osi=\"!Windows 2012\"
e.g:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
Then run "sudo update-grub".
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-22-generic 3.8.0-22.33
ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
Uname: Linux 3.8.0-22-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: felix 2436 F.... pulseaudio
/dev/snd/controlC0: felix 2436 F.... pulseaudio
/dev/snd/controlC1: felix 2436 F.... pulseaudio
Date: Fri May 24 17:05:25 2013
HibernationDevice: RESUME=UUID=a3e1a0e4-da74-4961-a4df-d5a5ccae333d
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=/boot/vmlinuz-3.8.0-22-generic root=UUID=c3662fb4-16b3-4a1d-808d-9530ba42ab52 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-22-generic N/A
linux-backports-modules-3.8.0-22-generic N/A
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.asset.tag: Not Available
dmi.board.name: 2349D17
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG1ET94WW(2.54):bd04/22/2013:svnLENOVO:pn2349D17:pvrThinkPadT430:rvnLENOVO:rn2349D17:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2349D17
dmi.product.version: ThinkPad T430
dmi.sys.vendor: LENOVO
This change was made by a bot.