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[Bug 596269] Re: LCD backlight stays off after resume



LCD stays off on Inspiron 1501 too.


** Changed in: linux (Ubuntu)
       Status: Expired => New

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  LCD backlight stays off after resume

Status in linux package in Ubuntu:

Bug description:
  The LCD backlight often stays off after resume and less often after
  opening the lid when it has been closed for a long time. The "vbetools
  dmps on", brightness controls, switching virtual consoles do not have
  any effect. Shutdown and restart usually don't fix the problem either.
  The only reliable way to get the backlight on again is to disconnect
  power, take out the battery, press the power button for a few seconds,
  put the battery back and then switch the computer on again. I found
  that solution at one of the forums.

  The very reliable way to reproduce the problem is:

  1. Set the "When laptop lid is closed" action in the On AC Power tab of the Power Management Preferences dialogue to Blank Screen, set that action to Suspend in the On Battery Power tab.
  2. Close the lid when connected to the power supply.
  3. Disconnect the power supply: laptop goes to the sleep mode.
  4. Open the lid: Laptop wakes up, but the backlight stays off.

  The closest bug report I found is:

  I am using Dell XPS m1330 with Intel integrated graphics (GM965).

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-22-generic 2.6.32-22.36
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic
  Uname: Linux 2.6.32-22-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: i386
   /dev/snd/controlC0:  vladimir   1641 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
   Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 21'
     Mixer name	: 'Silicon Image SiI1392 HDMI'
     Components	: 'HDA:83847616,1028020a,00100201 HDA:10951392,1028020a,00100000'
     Controls      : 32
     Simple ctrls  : 19
  Date: Sat Jun 19 20:50:16 2010
  HibernationDevice: RESUME=UUID=1117921a-2c72-45aa-9dec-44c330fc96c8
  MachineType: Dell Inc. XPS M1330
  ProcCmdLine: root=UUID=e8743d05-3772-460d-92c7-dddbdcf90c0e ro quiet splash
   PATH=(custom, user)
  RelatedPackageVersions: linux-firmware 1.34
  SourcePackage: linux
   # ALSA library configuration file
   # Include settings that are under the control of asoundconf(1).
   # (To disable these settings, comment out this line.)
  dmi.bios.date: 04/21/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0N6705
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd04/21/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn0N6705:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: XPS M1330
  dmi.sys.vendor: Dell Inc.

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