This should be fixed in the upstream 3.14-rc4 kernel by these two commits: commit bd8ba20597f0cfef3ef65c3fd2aa92ab23d4c8e1 - ACPI / video: Filter the _BCL table for duplicate brightness values commit 0e9f81d3b7cd0649a3bc437391b6a0650f98f844 - ACPI / video: Add systems that should favour native backlight interface
The first one has been cc'd to the stable kernel series. The second one is the one referred to above in comment #32. A PPA of the 3.14-rc4 kernel is available at http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1181927 Title: 8086:0106 [Aspire V5-431] 13.04: Brightness control visible but does nothing Status in “linux” package in Ubuntu: Triaged Bug description: Brightness control visible but does nothing on 13.04... The brightness up down buttons shows the overlay brightness icon going up and down but it does not change the brightness (backlight). I have tried adjusting the kernel options acpi_osi=<x> and acpi_backlight=<y> (that did work with 12.10) to make it work but to no avail. WORKAROUND: echo 20 > /sys/class/backlight/intel_backlight/brightness ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-generic 3.8.0.21.37 ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8 Uname: Linux 3.8.0-21-generic x86_64 ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: thomasc 2007 F.... pulseaudio Date: Mon May 20 12:45:35 2013 HibernationDevice: RESUME=UUID=2acc4a8c-a645-4f3c-bc8e-5c7a9d9df417 InstallationDate: Installed on 2013-04-11 (38 days ago) InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Alpha amd64 (20130410) MachineType: Acer Aspire V5-431 MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-21-generic root=UUID=4cfdb2ed-677a-4fd0-aa7d-5b118700bd35 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-21-generic N/A linux-backports-modules-3.8.0-21-generic N/A linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/12/2012 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: V1.20 dmi.board.asset.tag: No Asset Tag dmi.board.name: Aspire V5-431 dmi.board.vendor: Acer dmi.board.version: V1.20 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: Acer dmi.chassis.version: V1.20 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.20:bd12/12/2012:svnAcer:pnAspireV5-431:pvrV1.20:rvnAcer:rnAspireV5-431:rvrV1.20:cvnAcer:ct9:cvrV1.20: dmi.product.name: Aspire V5-431 dmi.product.version: V1.20 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1181927/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
