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[John D Marsden <1338063@xxxxxxxxxxxxxxxxxx>]

Upgrade to Ubuntu 3.13.0-30.55-generic 3.13.11.2 does not solve the
problem.

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https://bugs.launchpad.net/bugs/1338063

Title:
  Brightness control lost after suspend screen dimmed

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Using Ubuntu 14.04.  Recently updated to kernel version Ubuntu
  3.13.0-30.54-generic 3.13.11.2

  I expect brightness of my LCD screen to remain the same and be
  controllable after waking from suspend.  It doesn't and isn't.

  This seems to have only started recently - presumably after a recent
  update.

  What happens:

  Brightness controls fully working after initial boot, both through
  function keys and system settings.

  After putting computer into suspend and then re-awakening the LCD
  screen comes up with lowest brightness in actual appearance but
  settings still show the brightness as set at suspend time.  Controls
  for brightness have become ineffective - they slide the brightness bar
  along but make no difference to the actual brightness of the screen.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.54
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  john       2060 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jul  5 18:55:05 2014
  InstallationDate: Installed on 2012-06-04 (760 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: TOSHIBA PORTEGE Z835
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=865f4d37-5ceb-4e4a-b59b-032fa8a2c80b ro quiet splash elevator=noop vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-27 (68 days ago)
  dmi.bios.date: 02/08/2012
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.60
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.60:bd02/08/2012:svnTOSHIBA:pnPORTEGEZ835:pvrPT224U-01W00C:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: PORTEGE Z835
  dmi.product.version: PT224U-01W00C
  dmi.sys.vendor: TOSHIBA

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