To all those wondering about backlight in Precise and Quantal, if you switch your BIOS mode to UEFI, and reinstall Ubuntu in UEFI mode, it will fix the brightness issue. You can use your function keys out of the box, and they will change the brightness accordingly.
The only issue is, with the fresh Precise installation, you will need to update your kernel through the Updater, otherwise your brightness will be stuck on the lowest one. After an update, all issues gone, and you can use your laptop as is :D -- 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/954661 Title: backlight brightness not adjustable by default on Dell XPS 13 Status in Dell Sputnik: New Status in “linux” package in Ubuntu: Fix Released Status in “linux” source package in Precise: In Progress Status in “linux” source package in Quantal: In Progress Status in “linux” source package in Raring: Fix Released Bug description: The backlight brightness is not changeable by default on a Dell XPS 13 running Precise beta 1 (or later). If I run the following command as root, I can adjust the brightness: /bin/echo 0 > /sys/class/baclight/intel_backlight/brightness However, I must do this whenever I turn on the computer or resume it from suspend. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xserver-xorg-video-intel 2:2.17.0-1ubuntu4 ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9 Uname: Linux 3.2.0-18-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 1.94.1-0ubuntu2 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: None Date: Tue Mar 13 20:56:36 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:052e] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301) MachineType: Dell Inc. Dell System XPS L321X ProcEnviron: TERM=xterm LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=6a0a6c9c-fb29-446a-8806-e431d38c95e8 ro quiet splash i915.i915_enable_fbc=1 i915.i915_enable_rc6=1 pcie_aspm=force vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/30/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: A02 dmi.board.name: 085X6F dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA02:bd01/30/2012:svnDellInc.:pnDellSystemXPSL321X:pvr:rvnDellInc.:rn085X6F:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Dell System XPS L321X dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.7.0+bzr3035-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.30-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2 To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/954661/+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
