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the laptop connected to an external display, it is driving only the
external display when attached. if the hdmi cable is removed whilst lid
is closed, upon opening the lid computer locks up- display does not come
on. if lid is opened beforehand and the hdmi cable is removed, it causes
system to crash, displaying screen corruption, being unresponsive to any
input(capslock on /of virtual terminal etc).

*****UPDATE 20 Mar 2013****

It seems that simply entering a virtual console, and trying to revert back to 
the gui (ctrl+alt +f7, without reloading lightdm) also crashes the system , 
causing screen corruption.
**************

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.5.0-25-generic 3.5.0-25.39~precise1
ProcVersionSignature: Ubuntu 3.5.0-25.39~precise1-generic 3.5.7.4
Uname: Linux 3.5.0-25-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
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/controlC1:  anton      2007 F.... pulseaudio
 /dev/snd/controlC0:  anton      2007 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd4a00000 irq 48'
   Mixer name   : 'Realtek ALC262'
   Components   : 'HDA:10ec0262,104d3a00,00100302 
HDA:14f12c06,104d1700,00100000'
   Controls      : 19
   Simple ctrls  : 9
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd0030000 irq 49'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,104d3a00,00100100'
   Controls      : 6
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Mon Mar 18 20:23:11 2013
HibernationDevice: RESUME=UUID=96f3ccb2-c675-4cd3-a242-7f717a365e33
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 
(20130214)
MachineType: Sony Corporation VGN-NW11S_T
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-25-generic 
root=/dev/mapper/volumegrp01-volume02 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-25-generic N/A
 linux-backports-modules-3.5.0-25-generic  N/A
 linux-firmware                            1.79.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/27/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0180Y4
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.:bvrR0180Y4:bd08/27/2009:svnSonyCorporation:pnVGN-NW11S_T:pvrC601PLF4:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-NW11S_T
dmi.product.version: C601PLF4
dmi.sys.vendor: Sony Corporation

** Affects: xorg (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug kernel-bug-exists-upstream latest-bios-r0180y4 
precise qa-kernel-lts-testing
-- 
Unconnecting hdmi cable from port causes lock up and screen corruption
https://bugs.launchpad.net/bugs/1156819
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