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[Stefan Löffler <1211056@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "vendorbacklight"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1211056/+attachment/3768387/+files/vendorbacklight

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https://bugs.launchpad.net/bugs/1211056

Title:
  Backlight off after power failure on Lenovo Thinkpad SL510

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Recently, there was a power failure (i.e., the laptop ran on battery
  until that was empty) and subsequently shut down. I did not manage to
  rewake it again (after reestablishing the power supply), so I had to
  turn it off completely and reboot. The result is that the backlight is
  off. The LCD is still working normally (i.e., I can barely make out
  some contours in reflectance), as are external monitors (both VGA and
  HDMI work). When using the brightness hot-keys, the notification shows
  up (correctly indicating the change in brightness), but the backlight
  remains off, no matter what I do. I also tried xbacklight,
  /sys/class/backlight/..., setpci, etc., but to no avail.

  Following the guideline at
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight, I'm attaching the
  requested files. Changing the various acpi_* kernel boot parameters
  showed no change (except that the brightness controls changed to 7
  instead of 15 different settings).

  BTW: Booting into Windows showed the same effect. Also, during boot,
  the backlight is off and the external monitor is not getting a signal,
  so I can't check the bios.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-45-generic 3.2.0-45.70
  ProcVersionSignature: Ubuntu 3.2.0-45.70-generic 3.2.44
  Uname: Linux 3.2.0-45-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  stefan     2587 F.... pulseaudio
   /dev/snd/controlC0:  stefan     2587 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2600000 irq 50'
     Mixer name	: 'Realtek ALC269'
     Components	: 'HDA:10ec0269,17aa212c,00100004'
     Controls      : 16
     Simple ctrls  : 9
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xf2110000 irq 52'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100100'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6JHT64WW-1.184000'
     Mixer name	: 'ThinkPad EC 6JHT64WW-1.184000'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sun Aug 11 21:36:26 2013
  HibernationDevice: RESUME=UUID=79a6911e-e43c-4f76-9fd6-d0d1734b85e4
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MachineType: LENOVO 28476NG
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=de_DE:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 radeondrmfb
   1 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-45-generic root=UUID=0a0d615b-8dd8-4478-8940-94e2d3eb0fd0 ro quiet splash vga=792 acpi_osi=Linux
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-45-generic N/A
   linux-backports-modules-3.2.0-45-generic  N/A
   linux-firmware                            1.79.6
  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2012-05-03 (465 days ago)
  dmi.bios.date: 06/24/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6JET81WW (1.39 )
  dmi.board.name: 28476NG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6JET81WW(1.39):bd06/24/2010:svnLENOVO:pn28476NG:pvrThinkPadSL510:rvnLENOVO:rn28476NG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 28476NG
  dmi.product.version: ThinkPad SL510
  dmi.sys.vendor: LENOVO

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