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[Bug 1178205] Re: Screen brightness not changable via applet or hotkeys in Ubuntu 12.04 on Toshiba R850 notebook

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Jens, could you please provide the full computer model as noted on the
sticker?

** Description changed:

- Hello,
- 
- see $SUBJECT. By default the screen is very dark and almost unreadable.
- The Fn+F6/7 hotkeys show the brightness applet but don't change the
- brightness. Attached info according to
+ By default the screen is very dark and almost unreadable. The Fn+F6/7
+ hotkeys show the brightness applet but don't change the brightness.
+ Attached info according to
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight below.
  
- Adding "acpi_backlight=vendor" as suggested boot parameters fixes this
- bug, but this requires manual GRUB configuration (not suitable for non-
- experts).
- 
- Regards
- Jens
+ WORKAROUND: acpi_backlight=vendor
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-41-generic-pae 3.2.0-41.66
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic-pae 3.2.42
  Uname: Linux 3.2.0-41-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: i386
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  ubuntu     1655 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  ubuntu     1655 F.... pulseaudio
  Card0.Amixer.info:
-  Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50'
-    Mixer name	: 'Intel CougarPoint HDMI'
-    Components	: 'HDA:10ec0269,11790628,00100100 HDA:80862805,11790001,00100000'
-    Controls      : 29
-    Simple ctrls  : 11
+  Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50'
+    Mixer name	: 'Intel CougarPoint HDMI'
+    Components	: 'HDA:10ec0269,11790628,00100100 HDA:80862805,11790001,00100000'
+    Controls      : 29
+    Simple ctrls  : 11
  Date: Thu May  9 12:14:51 2013
  HibernationDevice: RESUME=UUID=add8fe24-1f1e-4ca7-a2d6-a0f40c03383f
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: TOSHIBA TECRA R850
  MarkForUpload: True
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic-pae root=UUID=ffc754ea-32ed-4ae7-b471-bca82bd54afb ro elevator=deadline quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.2.0-41-generic-pae N/A
-  linux-backports-modules-3.2.0-41-generic-pae  N/A
-  linux-firmware                                1.79.4
+  linux-restricted-modules-3.2.0-41-generic-pae N/A
+  linux-backports-modules-3.2.0-41-generic-pae  N/A
+  linux-firmware                                1.79.4
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2011
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.10
  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:bvrVersion3.10:bd08/25/2011:svnTOSHIBA:pnTECRAR850:pvrPT525E-043021GH:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: TECRA R850
  dmi.product.version: PT525E-043021GH
  dmi.sys.vendor: TOSHIBA

** Tags removed: backlight kernel-bug-exists-upstream notebook toshiba
** Tags added: kernel-bug-exists-upstream-v3.9 needs-full-computer-model needs-upstream-testing

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

-- 
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/1178205

Title:
  Screen brightness not changable via applet or hotkeys in Ubuntu 12.04
  on Toshiba R850 notebook

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  By default the screen is very dark and almost unreadable. The Fn+F6/7
  hotkeys show the brightness applet but don't change the brightness.
  Attached info according to
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight below.

  WORKAROUND: acpi_backlight=vendor

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-41-generic-pae 3.2.0-41.66
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic-pae 3.2.42
  Uname: Linux 3.2.0-41-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1655 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,11790628,00100100 HDA:80862805,11790001,00100000'
     Controls      : 29
     Simple ctrls  : 11
  Date: Thu May  9 12:14:51 2013
  HibernationDevice: RESUME=UUID=add8fe24-1f1e-4ca7-a2d6-a0f40c03383f
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: TOSHIBA TECRA R850
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic-pae root=UUID=ffc754ea-32ed-4ae7-b471-bca82bd54afb ro elevator=deadline quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-41-generic-pae N/A
   linux-backports-modules-3.2.0-41-generic-pae  N/A
   linux-firmware                                1.79.4
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2011
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.10
  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:bvrVersion3.10:bd08/25/2011:svnTOSHIBA:pnTECRAR850:pvrPT525E-043021GH:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: TECRA R850
  dmi.product.version: PT525E-043021GH
  dmi.sys.vendor: TOSHIBA

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