** Description changed: + == 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
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1183856 Title: Brightness control on Lenovo ThinkPad T430 does not work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1183856/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
