kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Florent Flament, could you please test the latest upstream kernel available from the very top line at the top of the page (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-3.16-rc3

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.

** Summary changed:

- Backlight control does not work, but there are entries in /sys/class/backlight - Toshiba Satellite Z930-164
+ [Toshiba Satellite Z930-164] Backlight control does not work, but there are entries in /sys/class/backlight

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

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1335458

Title:
  [Toshiba Satellite Z930-164] Backlight control does not work, but
  there are entries in /sys/class/backlight

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Following bug reporting process:
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Reporting_Backlight_Bugs

  Running Ubuntu 14.04 with Unity.

  
  Testing for a work around:

  * With kernel parameter acpi_backlight=vendor
    -> Brightness control is working with both applet and hotkeys.

    - # echo 8 > /sys/class/backlight/intel_backlight/brightness
      -> The command sets the screens brightness very low (almost turns
         it off).

  * With kernel parameter video.use_bios_initial_backlight=0
    -> Brightness control is neither working with applet nor hotkeys.

  * With kernel parameter video.use_native_backlight=1
    -> Brightness control is working with both applet and hotkeys.

  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:  florent    2107 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jun 28 18:17:42 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=/dev/mapper/toshnux--vg-swap_1
  MachineType: TOSHIBA SATELLITE Z930
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=/dev/mapper/hostname--vg-root ro splash quiet acpi_backlight=vendor 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
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/04/2013
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 6.70
  dmi.board.asset.tag: 0000000000
  dmi.board.name: SATELLITE Z930
  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:bvrVersion6.70:bd04/04/2013:svnTOSHIBA:pnSATELLITEZ930:pvrPT23LE-01900EFR:rvnTOSHIBA:rnSATELLITEZ930:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: SATELLITE Z930
  dmi.product.version: PT23LE-01900EFR
  dmi.sys.vendor: TOSHIBA

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