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[Stevan Pettit <877127@xxxxxxxxxxxxxxxxxx>]

I tried everything I could think of and could not reproduce this
behavior.

Sent a song live.

1. Changed resolution of secondary monitor to both a higher and lower
resolution.  Song looked "funny", but no problems with OpenLP .

2. Unplugged secondary monitor.  All screen went black for a second
(normal behavior).  OpenLP was still responsive.

3. Plugged secondary monitor back in, OpenLP was fine.

4. Switched from VGA to HDMI out for the secondary monitor.  After
adjusting the 2 displays to "extend", repeated the above.  Again, no
problems.

I'm using OpenLP bzr-1785
Win 7 Professional (x64)
Toshiba Laptop  (Intel core i3, 2.60Ghz, 4gb ram)
Using the onboard graphics (Intel HD)

Repeated the tests on another machine.

Win XP Pro, SP3
Dell  (AMD Athlon II, x2 250, 3.00Ghz, 3gb ram)
ATI Radeon HD 3200 Graphics

No problems.


Installed OpenLP 1.9.7 on both machines
Repeated all tests on both machines.

Again, no problems.


Have you tried another application using the secondary monitor (ie, Picture Viewer, FastStone Image Viewer, VLC Media Player).  I tried all these apps displaying on secondary monitor and changed resolution "on-the-fly" and had no problems.

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https://bugs.launchpad.net/bugs/877127

Title:
  UI hangs on display change (win7)

Status in OpenLP - Worship Presentation Software:
  New

Bug description:
  Ver: Win7 Home Premium x64, OpenLP 1.9.7

  # Steps to reproduce:
  1. Run OpenLP
  2. Make a change to display configuration outside of OpenLP
  Expected: OpenLP detects change and updates accordingly
  Actual: OpenLP cursor changes to busy, and UI hangs (interface is unresponsive)

  # Identified three cases:
  1. Remove a screen (lose video sync). On my PC this occurs about 2 seconds after the VGA cable is unplugged. At this point all screens temporarily black out.
  2. Add a screen.
  3. Change display resolution of any screen.

  # Symptoms:
  * Cursor shows busy indicator when over the OpenLP window.
  * Entire OpenLP interface is unresponsive. It will not come to the foreground when activated, whether by clicking on taskbar, or on a visible part of window.
  * Rest of PC is fine, only OpenLP interface is unresponsive.
  * Task manager does _not_ show any errors such as "Not responding".
  * If the removed screen is added back before force close, the display on the screen is the same as before the screen was removed, but application is still unresponsive.

  # What happens on close:
  * If no dialogs are set to pop up:
   - Right click on taskbar icon, select "Close window".
   -> OpenLP closes instantly.
  * If dialogs are set to pop up (eg unsaved service or exit confirmation)
   - Right click on taskbar icon, select "Close window",
   - The dialog pops up immediately, and brings entire OpenLP window to foreground, but you cannot interact with any of it
   -> No option but to force close via Task Manager

  # Analysis: 
  In each case, the debug log shows that the display change was correctly detected. At least part of the OpenLP core is still running fine because (non-responsive) dialogs pop up, and it closes ok (see debug log) if there's no dialogs. But the UI hangs indefinitely.
   
  # Attached debug logs:
  openlp 1.9.7 remove_add_remove_screen.log
   - screen removed, wait 15 min, added, then removed again -> force close
  openlp 1.9.7 add_screen w exit_confirm.log
   - screen added, "Enable application exit confirmation" checked -> force close
  openlp 1.9.7 change_res.log
   - resolution of second screen changed

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