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[James <963933@xxxxxxxxxxxxxxxxxx>]

Hi there. Yes it still affects me. I am still on 12.04, and
unfortunately as I have to use this laptop for work, I can't risk trying
out development releases.

My work around is to simply not hot plug the monitor (i.e. shut down if
I want to remove or add the 27" monitor), so if no-one else is bothered
by this I am happy for it to be closed.

The only things this affects really is my discussion with people about
Ubuntu: "oh yes Ubuntu is great, apart from it crashes if I unplug my
monitor...".

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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)

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