Dayana, thank you for reporting this and helping make Ubuntu better.

1) Could you please provide the full computer model as noted on the
sticker of the computer itself (not from the Bug Description, or the
result of a terminal command)?

2) Is this something that stopped working after an update? If so, which?

3) To see if this is already resolved in Ubuntu, could you please test
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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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/1722622

Title:
  Brightness

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I can't change the brightness

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-132.181-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-132-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.25
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Oct 10 21:51:19 2017
  DistUpgraded: 2017-10-09 23:27:38,749 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display 
[8086:0f31] (rev 0c) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:2213]
  InstallationDate: Installed on 2017-10-06 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  MachineType: Hewlett-Packard HP 15 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-132-generic 
root=UUID=f74ed4d8-459a-4372-9992-efa8be3f558e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2017-10-09 (0 days ago)
  dmi.bios.date: 05/26/2015
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.39
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 2213
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 57.54
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.39:bd05/26/2015:svnHewlett-Packard:pnHP15NotebookPC:pvr0991100000000000000600087:rvnHewlett-Packard:rn2213:rvr57.54:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP 15 Notebook PC
  dmi.product.version: 0991100000000000000600087
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11.3+14.04.20160425-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.14.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.6
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.6
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.910-0ubuntu1.7
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Oct 10 21:42:38 2017
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5547 
   vendor                                     CMN
  xserver.version: 2:1.15.1-0ubuntu2.9

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