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

** Summary changed:

- [Toshiba L735-101] screen brightness cannot be set using hotkeys
+ BTRFS [Toshiba L735-101] screen brightness cannot be set using hotkeys

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https://bugs.launchpad.net/bugs/971750

Title:
  BTRFS [Toshiba L735-101] screen brightness cannot be set using hotkeys

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  On my Toshiba L735-101, using btrfs, screen brightness keys do not
  allow screen brightness to be set. Actual brightness is always maximum
  (i.e. much too bright...).

  If I boot "normally" , screen brightness keys have no effect at all.

  If I boot adding the "acpi_backlight=vendor" option, then the
  brighness hotkeys cause the corresponding pop-up  level bar to display
  (modulo bug #971734), still there is no change on actual screen
  brightness.

  Video board is :
  [    74.130] (II) NVIDIA(0): NVIDIA GPU GeForce 315M (GT218) at PCI:1:0:0 (GPU-0)

  Boot dmesg shows some funny stuff :
  [    3.346332] [Firmware Bug]: ACPI(VGA) defines _DOD but not _DOS

  Putting the following in /etc/X11/xorg.conf does not help:
  Option	"RegistryDwords"	"EnableBrightnessControl=1"

  # ll /sys/class/backlight/toshiba/
  total 0
  drwxr-xr-x 3 root root    0 avril  2 19:20 ./
  drwxr-xr-x 3 root root    0 avril  2 19:20 ../
  -r--r--r-- 1 root root 4096 avril  2 19:47 actual_brightness
  -rw-r--r-- 1 root root 4096 avril  2 19:47 bl_power
  -rw-r--r-- 1 root root 4096 avril  2 19:23 brightness
  lrwxrwxrwx 1 root root    0 avril  2 19:47 device -> ../../../TOS1900:00/
  -r--r--r-- 1 root root 4096 avril  2 19:23 max_brightness
  drwxr-xr-x 2 root root    0 avril  2 19:47 power/
  lrwxrwxrwx 1 root root    0 avril  2 19:20 subsystem -> ../../../../../../class/backlight/
  -r--r--r-- 1 root root 4096 avril  2 19:23 type
  -rw-r--r-- 1 root root 4096 avril  2 19:20 uevent

  => Using the brightness hotkeys cause the value of "brightness" to
  change here (only if booted with "acpi_backlight=vendor"), but the
  value of "actual_brightness" doesn't change (nor the screen actual
  brigthness...)

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-21-generic 3.2.0-21.34
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Uname: Linux 3.2.0-21-generic i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0-0ubuntu2
  Architecture: i386
  CheckboxSubmission: 1ea6109db29b53f721a523a77b7f3abf
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  Date: Mon Apr  2 19:39:09 2012
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=0e7ded16-c4fc-4f81-8562-3cb1196809d3
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: TOSHIBA SATELLITE L735
  ProcEnviron:
   LANGUAGE=fr_FR:fr:en_US:en
   TERM=xterm
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-21-generic root=/dev/mapper/VG1-UBUNTU ro rdblacklist=nouveau nouveau.blacklist=1 acpi_backlight=vendor clocksource=hpet rdblacklist=nouveau nouveau.blacklist=1 acpi_backlight=vendor quiet splash vt.handoff=7
  SourcePackage: linux
  StagingDrivers: rts5139 mei
  UpgradeStatus: Upgraded to precise on 2012-03-10 (23 days ago)
  dmi.bios.date: 02/10/2012
  dmi.bios.vendor: INSYDE
  dmi.bios.version: 2.20
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: Intel Corp.
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvr2.20:bd02/10/2012:svnTOSHIBA:pnSATELLITEL735:pvrPSK0CE-00900LFR:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: SATELLITE L735
  dmi.product.version: PSK0CE-00900LFR
  dmi.sys.vendor: TOSHIBA
  ---
  ApportVersion: 2.5.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  michel     3640 F.... pulseaudio
   /dev/snd/controlC0:  michel     3640 F.... pulseaudio
  CRDA:
   country FR:
    (2402 - 2482 @ 40), (N/A, 20)
    (5170 - 5250 @ 40), (N/A, 20)
    (5250 - 5330 @ 40), (N/A, 20), DFS
    (5490 - 5710 @ 40), (N/A, 27), DFS
  CheckboxSubmission: 1ea6109db29b53f721a523a77b7f3abf
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  DistroRelease: Ubuntu 12.10
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=b49c11a6-09a7-4da7-9efa-500df0c9d257
  MachineType: TOSHIBA SATELLITE L735
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/UBUNTU/@boot/vmlinuz-3.5.0-12-generic root=/dev/mapper/VG1-BTR_POOL ro rootflags=subvol=UBUNTU/@ rdblacklist=nouveau nouveau.blacklist=1 acpi_osi=Linux acpi_backlight=vendor quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-12.12-generic 3.5.2
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/michel not ours.
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-12-generic N/A
   linux-backports-modules-3.5.0-12-generic  N/A
   linux-firmware                            1.90
  StagingDrivers: rts5139
  Tags:  quantal staging
  Uname: Linux 3.5.0-12-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-08-28 (0 days ago)
  UserGroups:

  dmi.bios.date: 06/26/2012
  dmi.bios.vendor: INSYDE
  dmi.bios.version: 2.50
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: Intel Corp.
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvr2.50:bd06/26/2012:svnTOSHIBA:pnSATELLITEL735:pvrPSK0CE-00900LFR:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: SATELLITE L735
  dmi.product.version: PSK0CE-00900LFR
  dmi.sys.vendor: TOSHIBA~

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