What do you mean by "not adjustable"? You do not have UI controls to adjust it? Or the UI controls that should adjust it just do nothing? If it is the 2nd option, then I have reported a duplicate (and have a work- around).
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1377351 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1313892 Title: Display Brightness not Adjustable Status in “xorg” package in Ubuntu: Confirmed Bug description: After upgrade to 14.04, display brightness is does no longer adjustable through system configuration. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8 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: [core,bailer,detection,composite,opengl,compiztoolbox,decor,imgpng,vpswitch,place,gnomecompat,move,mousepoll,resize,snap,grid,unitymtgrabhandles,wall,session,regex,animation,fade,workarounds,expo,scale,ezoom,unityshell] CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Mon Apr 28 21:45:36 2014 DistUpgraded: 2014-04-22 15:37:30,834 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: virtualbox, 4.3.10, 3.11.0-19-generic, x86_64: installed virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Sony Corporation Device [104d:9084] MachineType: Sony Corporation VPCZ21C5E ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/volgrp0-vol1 ro splash quiet nomdmonddf nomdmonisw vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to trusty on 2014-04-22 (6 days ago) dmi.bios.date: 06/16/2011 dmi.bios.vendor: INSYDE dmi.bios.version: R0170H5 dmi.board.asset.tag: N/A dmi.board.name: VAIO dmi.board.vendor: Sony Corporation dmi.board.version: N/A dmi.chassis.asset.tag: N/A dmi.chassis.type: 10 dmi.chassis.vendor: Sony Corporation dmi.chassis.version: N/A dmi.modalias: dmi:bvnINSYDE:bvrR0170H5:bd06/16/2011:svnSonyCorporation:pnVPCZ21C5E:pvrJ004MG71:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A: dmi.product.name: VPCZ21C5E dmi.product.version: J004MG71 dmi.sys.vendor: Sony Corporation 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: Sat Apr 26 16:17:49 2014 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 37 vendor MS_ xserver.version: 2:1.15.1-0ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1313892/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp