After suspend / resume only one monitor of dual head usable

[Colin Law]

Using unity-2d on Precise, with dual head system, after suspend/resume I find about 50% of the time that only the external monitor is enabled. The mouse will only move on that display and the launcher is shown on that display when before suspend it was on the laptop display. Furthermore I cannot re-enable the laptop display using System Settings > Displays (the laptop shows as Off, and if I enable it it shows On but does not in fact come on). I have to reboot in order to re-activate it.

Further analysis added 20 Mar 12 as described in comment #7
In System Settings > Power I have Do Nothing as the action on lid close (as there is a problem with this Toshiba Satellite laptop if the lid is used to suspend). I am suspending using the top panel menu action.
If I close the lid then I find that it turns off the laptop display and the PC switches to single monitor mode on the external monitor, which is ok. On opening the lid it reverts to dual monitor mode.
The bug described here is triggered if I initiate the suspend but then close the lid before the suspend is complete. On re-opening the lid the PC resumes but the laptop display does not switch back on.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pm-utils 1.4.1-9
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic i686
ApportVersion: 1.93-0ubuntu2
Architecture: i386
Date: Fri Feb 24 14:28:04 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111129.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

[Colin Law (colin-law)]

Syslog attached. The suspend was at 14:06 Feb 24, resume at 14:21. The only errors I can see are
Feb 24 14:21:54 piglet kernel: [ 3180.706592] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
Feb 24 14:21:54 piglet kernel: [ 3180.706634] [drm:i915_gem_do_execbuffer] *ERROR* Object f25bcf00 [handle 79, index 1] appears more than once in object list

[Colin Law (colin-law)]

Some more information. This happens about 1 in 2 times that I suspend/resume.
I tried disconnecting the external monitor before suspending and when I resumed the laptop screen came up ok. When I plugged the external monitor back in, however, the display switched to the external monitor, the laptop one went off, and I was back to square one again.

Is there any other data I can provide to help analyse this? I am sure others will eventually fall over it once more users pick up 12.04.

[Colin Law (colin-law)]

Marking this as fixed since recent updates seem to have removed the problem

[Colin Law (colin-law)]

Reverting status as it has not gone away. It is happening only about 1 in 10 times now, I am hoping to find what is triggering it, if anything, but so far have not tied it down.

[Colin Law (colin-law)]

I have determined the action that triggers this. In System Settings > Power I have Do Nothing as the action on lid close (as there is a problem with this Toshiba Satellite laptop if the lid is used to suspend). I am suspending using the top panel menu action.
If I close the lid then I find that it turns off the laptop display and the PC switches to single monitor mode on the external monitor, which is ok. On opening the lid it reverts to dual monitor mode.
The bug described here is triggered if I initiate the suspend but then close the lid before the suspend is complete. On re-opening the lid the PC resumes but the laptop display does not switch back on.
I will add this to the description.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[penalvch (penalvch)]

Colin Law, could you please execute the following via a terminal in order for the necessary debugging information to be attached:
apport-collect 940350

[Colin Law (colin-law)]

@Christopher, no I can't I am afraid. The machine is now running 14.04 and the problem is no longer seen. Even if I could, is work still being done to fix non-critical Unity 2d bugs?
Possibly it is still affecting one of the other affected users.

[penalvch (penalvch)]

Colin Law, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/940350/comments/10 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.