There is a better fix queued up for the upstream 4.1 kernel. It consists of these two patches:
acpi: video: Allow forcing native backlight on non win8 machines acpi: video: Add enable native backlight quirk for Lenovo Ideapad Z570 -- 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/1331442 Title: Screen Brightness keys do not work on Lenovo IdeaPad Z570 Status in linux package in Ubuntu: Confirmed Bug description: I've installed 14.04 from scratch but had this issue under 13.10 too. The key combination Fn+<brightness up/down> trigger the brightness overlay in the top right corner but the actual brightness does not change. See attached screenshot ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-29-generic 3.13.0-29.53 ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2 Uname: Linux 3.13.0-29-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: seb 1951 F.... pulseaudio /dev/snd/pcmC0D0p: seb 1951 F...m pulseaudio CurrentDesktop: Unity Date: Wed Jun 18 22:25:22 2014 EcryptfsInUse: Yes InstallationDate: Installed on 2014-06-14 (3 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac (20140417) MachineType: LENOVO 10247MM ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=4424b647-bd6c-425e-bc1f-a170d430217d ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-29-generic N/A linux-backports-modules-3.13.0-29-generic N/A linux-firmware 1.127.2 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 10/21/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 45CN38WW dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Emerald Lake dmi.board.vendor: LENOVO dmi.board.version: FAB1 dmi.chassis.asset.tag: Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnLENOVO:bvr45CN38WW:bd10/21/2011:svnLENOVO:pn10247MM:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1: dmi.product.name: 10247MM dmi.product.version: Ideapad Z570 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1331442/+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
