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[James <963933@xxxxxxxxxxxxxxxxxx>]

apport information

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https://bugs.launchpad.net/bugs/963933

Title:
  System freeze when hotplug 27" monitor in Ubuntu 12.04

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I'm not sure if this is a bug yet, hence the question.

  I have a Dell XPS 17" laptop (1920x1080 resolution) and recently got a
  new Dell 27" monitor (2560x1440 res). The laptop has an nVidia
  discrete card, but I don't actually have it set up (i.e. I haven't got
  around to successfully setting up Bumblebee yet), so I'm assuming this
  is all on the Intel card. The external monitor is connected via a Mini
  Display Port to Dual-Link DVI (the Apple branded one) adapter, then
  via DVI cable to the monitor (it's all I have around that works).

  If I boot the laptop with the external monitor connected, everything
  works perfectly (except the login screen goes very low res, but I can
  live with that). However, if I unplug it while connected, the display
  will go black with the mouse cursor still visible, and completely lock
  up. Caps lock does not go on/off, will not respond to SysRq,
  Ctrl+Alt+Del, switching to a different terminal (Ctrl+Alt+F1 etc.).
  Only a hard reboot will do the job.

  The same happens in all these scenarios:
  - Unplugging the monitor when booted with it connected
  - "Hot" plugging the monitor after booted
  - Hitting "Apply" after making changes in System Settings > Display (e.g. if I try to move the monitor positions around)

  It's not a show stopper for me, I just must be careful not to do the
  above, which can be inconvenient sometimes.

  I am not sure where to even start looking, /var/log/syslog does not
  seem to contain any useful information, nor does /var/log/dmesg.0 or
  /var/log/Xorg.0.log

  If I boot from cold with the monitor attached, and avoid the Display
  settings, everything works perfectly - correct resolution etc.

  System details follow:

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=12.04
  DISTRIB_CODENAME=precise
  DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"

  
  $ lspci | grep -i vga
  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
  01:00.0 VGA compatible controller: NVIDIA Corporation Device 124d (rev ff)

  --- 
  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: PCH [HDA Intel PCH], device 0: ALC665 Analog [ALC665 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  james      3008 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf3c00000 irq 54'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0665,10280571,00100003 HDA:80862805,80860101,00100000'
     Controls      : 32
     Simple ctrls  : 14
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=1695b760-d45b-43f4-85b4-30adb573e7e6
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  MachineType: Dell Inc. Dell System XPS L702X
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-52-generic root=UUID=5b277476-b8c0-4ed8-ba6b-4c5d717137e1 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-52.78-generic 3.2.48
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-52-generic N/A
   linux-backports-modules-3.2.0-52-generic  N/A
   linux-firmware                            1.79.6
  StagingDrivers: mei
  Tags:  precise running-unity staging
  Uname: Linux 3.2.0-52-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 01/10/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 0XN71K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: FAB1
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA16:bd01/10/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L702X
  dmi.sys.vendor: Dell Inc.

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