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.
** Description changed: 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/940350 Title: After suspend / resume only one monitor of dual head usable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/940350/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
