kernel-packages team mailing list archive

[Florent Flament <contact@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug trusty

** Attachment added: "acpi"
   https://bugs.launchpad.net/bugs/1335458/+attachment/4141406/+files/acpi

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1335458

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

Status in “linux” package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1335458/+subscriptions