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[Bug 1214148] Re: [Toshiba Portege Z935-ST4N03] Intel video: Display backlight cannot be changed


Alan Pater, thank you for your comment. So your hardware and problem may be tracked, could you please file a new report with Ubuntu by executing the following in a terminal while booted into a Ubuntu repository kernel (not a mainline one) via:
ubuntu-bug linux

For more on this, please read the official Ubuntu documentation:
Ubuntu Bug Control and Ubuntu Bug Squad: https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue
Ubuntu Kernel Team: https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
Ubuntu Community: https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Thank you for your understanding.

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  [Toshiba Portege Z935-ST4N03] Intel video: Display backlight cannot be

Status in “linux” package in Ubuntu:

Bug description:
  On my Toshiba Portege Z935-ST4N03 laptop, the display hotkeys and
  display brightness settings do not work at all.

  1. When I use Fn F6 or Fn F7, I get a pop-up window that shows a light bulb and a slider, and the slider goes obediently up and down as I press F6/7. However, the brightness of the screen does not change as the slider indicator changes.
  2. If I go into the Power Manager and set the display brightness to dim after a few seconds has passed, it doesn't dim.

  So it seems to me that the hotkeys are being recognized as a method to
  change the display brightness, but that the operating system is unable
  to change the hardware's actual screen brightness... I don't think
  it's a hotkey problem per se.

  I read through https://wiki.ubuntu.com/Kernel/Debugging/Backlight and
  I think I have the problem defined as:

  Backlight control does not work, but there are entries in

  Although I do not seem to have the Brightness applet on my system (I
  am running XFCE, so maybe that is why), but the Power Manager's
  brightness control is definitely not working.

  This is a recent install of Ubuntu, on a newly purchased laptop, so I
  have no idea whether it was working in previous versions of Ubuntu,
  kernels, etc. Sorry.

  I used the "ubuntu-bug" utility to report this bug, so I am not sure
  what else you need... but I am starting by attaching the Xorg log, and
  will attach the lspci output and other information shortly. I am also
  going to follow the rest of the debugging steps on the Backlight
  debugging page and attach the output as separate comments on this

  $ lsb_release -rd
  Description:	Ubuntu 13.04
  Release:	13.04

  $apt-cache policy xorg
    Installed: 1:7.7+1ubuntu4
    Candidate: 1:7.7+1ubuntu4
    Version table:
   *** 1:7.7+1ubuntu4 0
          500 http://us.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic
  Uname: Linux 3.8.0-27-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  Date: Mon Aug 19 14:01:34 2013
  InstallationDate: Installed on 2013-06-17 (62 days ago)
  InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  MarkForUpload: True
   PATH=(custom, no user)
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)

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