On 16.04 (and 14.04), the following link fixed it for me: https://itsfoss.com/fix-brightness-ubuntu-1310/
-- 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/1255428 Title: 8086:0116 [Lenovo IdeaPad Z570] LCD brightness control keys and widget do not work on Intel Graphics Status in linux package in Ubuntu: Expired Bug description: After upgrading to Saucy, on my Lenovo IdeaPad Z570 with Intel HD Graphics 3000, it is no longer possible to control the LCD brightness using the hardware brightness control keys. Likewise for the KDE power management settings or the battery icon on my Kubuntu Plasma tray. (I don't use GNOME/Unity.) Until Raring I did not have this problem. WORKAROUND: At a terminal: echo 150 | sudo tee /sys/class/backlight/intel_backlight/brightness where 150 is on the scale of 0 to whatever is given within /sys/class/backlight/intel_backlight/max_brightness. Based on this I wrote a GUI which however needs to be run using sudo/kdesudo/gksudo. I have attached it. --- ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 DistroRelease: Ubuntu 13.10 InstallationDate: Installed on 2013-10-19 (38 days ago) InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MarkForUpload: True Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6 Tags: saucy Uname: Linux 3.11.0-13-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo --- ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: samjnaa 1717 F.... pulseaudio DistroRelease: Ubuntu 13.10 HibernationDevice: RESUME=UUID=ba00d992-e43e-4bce-8689-9647370add15 InstallationDate: Installed on 2013-10-19 (117 days ago) InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: LENOVO HuronRiver Platform MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=(hd0,msdos9)/vmlinuz root=/dev/sda9 ro quiet splash ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 RelatedPackageVersions: linux-restricted-modules-3.11.0-15-generic N/A linux-backports-modules-3.11.0-15-generic N/A linux-firmware 1.116 StagingDrivers: rts5139 Tags: saucy staging Uname: Linux 3.11.0-15-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 02/22/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 45CN28WW 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:bvr45CN28WW:bd02/22/2011:svnLENOVO:pnHuronRiverPlatform:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1: dmi.product.name: HuronRiver Platform 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/1255428/+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
