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[teo1978 <teo8976@xxxxxxxxx>]

Yes I can still reproduce the issue, but it happens when HIBERNATING,
not suspending (not sure whether it has changed or whether I erroneously
wrote "suspend" when reporting it).

The issue is even much worse than I thought: if you happen to have the
external screen available and you do re-plug it after resuming from
hibernation, the output to the external screen will appear but the
system will be frozen and won't respond to mouse or keyboard input. You
have to switch it off via hardware.

** Description changed:

  Steps to reproduce:
  - connect an external monitor to a laptop
- - enable only the external monitor and disable the laptop's builtin monitor, as in: disper -S
- - suspend
+ - enable only the external monitor and disable the laptop's builtin monitor
+ - hibernate
  - disconnect the external monitor and take your laptop to another place
- - resume from suspend, ready to resume working happily with all your unsaved data
+ - resume from hibernation, ready to resume working happily with all your unsaved data
  
  Expected behavior:
  - on resume, the system should detect that the only screen that was enabled is no longer available, and that the only available screen is the builtin one, so it should enable it.
  
  Observed behavior:
- - the builtin screen is still disabled, so you have no usable screen. Everything is probably there and working, but you can't see anything, so you can't even switch screen back to enable the builtin screen
+ - the builtin screen is still disabled, so you have no usable screen. 
+ - if you do have the external screen available and re-connect it, then the screen will show up on the external monitor, but the system is frozen, unresponsive to keyboard and mouse input (and doesn't even react to connecting usb devices, I can tell because if I connect an external keyboard its leds won't turn on). The only way out is a hadrware power off.
  
- As a workaround I've tried Ctrl+Alt+F1 to access a virtual terninal, and
- it works, but I don't know of any command that can be executed from the
- virtual terminal that would force xorg to switch screen. "disper -s"
- doesn't work if run from the virtual terminal.
+ This is critical, as it causes data loss.
  
- So the only option you have is to kill Xorg or reboot, loosing in both
- cases all unsaved data.
  
- Unless you can manage your system blindly, and manage to switch screen
- without seing what you're doing.
+ Last reproduced on 14.04.
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: unity 6.12.0-0ubuntu0.2
  ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  CompizPlugins: [core,composite,opengl,decor,vpswitch,mousepoll,compiztoolbox,snap,commands,place,resize,session,regex,grid,wall,move,gnomecompat,imgpng,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Sun Mar 24 13:22:59 2013
  InstallationDate: Installed on 2010-06-23 (1005 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: Upgraded to quantal on 2013-01-13 (70 days ago)

** Summary changed:

- System completely inaccessible after suspend/resume if the only enabled screen is no longer available
+ System completely inaccessible after hibernate/resume if the only enabled screen is no longer available

** Changed in: unity
       Status: Incomplete => New

** Changed in: unity (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1159404

Title:
  System completely inaccessible after hibernate/resume if the only
  enabled screen is no longer available

Status in Unity:
  New
Status in unity package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  - connect an external monitor to a laptop
  - enable only the external monitor and disable the laptop's builtin monitor
  - hibernate
  - disconnect the external monitor and take your laptop to another place
  - resume from hibernation, ready to resume working happily with all your unsaved data

  Expected behavior:
  - on resume, the system should detect that the only screen that was enabled is no longer available, and that the only available screen is the builtin one, so it should enable it.

  Observed behavior:
  - the builtin screen is still disabled, so you have no usable screen. 
  - if you do have the external screen available and re-connect it, then the screen will show up on the external monitor, but the system is frozen, unresponsive to keyboard and mouse input (and doesn't even react to connecting usb devices, I can tell because if I connect an external keyboard its leds won't turn on). The only way out is a hadrware power off.

  This is critical, as it causes data loss.

  
  Last reproduced on 14.04.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: unity 6.12.0-0ubuntu0.2
  ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  CompizPlugins: [core,composite,opengl,decor,vpswitch,mousepoll,compiztoolbox,snap,commands,place,resize,session,regex,grid,wall,move,gnomecompat,imgpng,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Sun Mar 24 13:22:59 2013
  InstallationDate: Installed on 2010-06-23 (1005 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: Upgraded to quantal on 2013-01-13 (70 days ago)

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