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[Launchpad Bug Tracker <668554@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/668554

Title:
  10de:0a2a [Sony VAIO VPCCW16FG] Blank display at startup

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  In all versions of ubuntu after Karmic, sony vaio CW series, ends up
  in a blank display when booted directly. The computer starts perfectly
  and the startup tone can be heard in speakers. This is possibly caused
  because the driver (nouveau) is not able to read the EDID information
  of the display attached to laptop. When I connect external display to
  my HDMI port, it works fine. But the laptop's built in display is not
  detected at all.

  The primary reason of this problem is that of the EDID data. Even when
  I install Nvidia drivers in karmic, the same blank display can be
  reproduced. In lucid and maverick, this is due to maverick. However,
  the default drivers in case of karmic(NV or neva) happens to make the
  display appear.

  In maverick or in lucid, I can boot into the computer using
  'nomodeset' in boot options in
  grub(http://lemoney92.blogspot.com/2010/09/linux-blank-screen-
  problem.html). This possibly disables nouveau driver and boots up with
  the default display driver.

  Also I can make the Nvidia driver work in karmic and in lucid, by
  forcing the driver use the edid exported from windows. This enables
  the 3D effects however I'm not able to switch to a VT.

  Also the brightness of my display does not change at all. There is a workaround related to nvidia_bl module.
  http://ubuntuforums.org/showthread.php?t=1420341

  All these problems are linked and possibly the base it that kernel is
  not able fetch EDID information from the laptop's display.

  Here are some of forums that discuss the issue
  http://www.nvnews.net/vbulletin/showthread.php?t=140482
  http://ubuntuforums.org/showthread.php?t=1470822
  http://ubuntuforums.org/showthread.php?t=1599728
  http://ubuntuforums.org/showthread.php?t=1393940

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-22-generic 2.6.35-22.33
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simar      1587 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd8d00000 irq 48'
     Mixer name	: 'Realtek ALC262'
     Components	: 'HDA:10ec0262,104d3b00,00100302'
     Controls      : 12
     Simple ctrls  : 8
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xd3080000 irq 16'
     Mixer name	: 'Nvidia GT220 HDMI'
     Components	: 'HDA:10de000a,104d3b00,00100100'
     Controls      : 16
     Simple ctrls  : 4
  Date: Sat Oct 30 02:18:09 2010
  HibernationDevice: RESUME=/dev/sda6
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: Sony Corporation VPCCW16FG
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=06ea1d28-da8e-4406-a4ae-dd173ff59244 ro quiet splash nomodeset
  ProcEnviron:
   LANG=en_IN
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38
  SourcePackage: linux
  dmi.bios.date: 09/22/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R0190Y5
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0190Y5:bd09/22/2009:svnSonyCorporation:pnVPCCW16FG:pvrC602E0UF:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCCW16FG
  dmi.product.version: C602E0UF
  dmi.sys.vendor: Sony Corporation

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