Public bug reported: I am running on an HP EliteBook Folio 9470m which has an i915 video chipset.
After upgrading to 14.04, the backlight and brightness controls do not work on the laptop screen. $ sudo intel_backlight current backlight value: 4% ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Fri Apr 18 08:02:05 2014 DistUpgraded: 2014-04-18 01:03:05,027 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: openvswitch, 2.0.1+git20140120: added ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:18df] InstallationDate: Installed on 2013-01-14 (459 days ago) InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3) MachineType: Hewlett-Packard HP EliteBook Folio 9470m ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu-root ro quiet splash "acpi_osi=!Windows 2012" vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: Upgraded to trusty on 2014-04-18 (0 days ago) dmi.bios.date: 09/24/2012 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68IBD Ver. F.30 dmi.board.name: 18DF dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 62.13 dmi.chassis.asset.tag: CNU2439PZT dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68IBDVer.F.30:bd09/24/2012:svnHewlett-Packard:pnHPEliteBookFolio9470m:pvrA1029D1103:rvnHewlett-Packard:rn18DF:rvrKBCVersion62.13:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook Folio 9470m dmi.product.version: A1029D1103 dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5 version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Fri Apr 18 01:04:29 2014 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 5239 vendor CMN xserver.version: 2:1.15.1-0ubuntu2 ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1309584 Title: Backlight does not work on intel driver after upgrade from 13.10 -> 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1309584/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs