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[Harald Sitter <sitter.harald@xxxxxxxxx>]

Tried it, doesn't fix plasmashell exploding (not in the particular test case presented anyway). A bit of research suggests that this type of issue has multiple causes and is in fact only fixed by a combination of multiple commits (see the code review tabs on the bug reports below).
The last bug in particular seems to carry the majority of relevant patches.

https://bugreports.qt.io/browse/QTBUG-32973
https://bugreports.qt.io/browse/QTBUG-32681
https://bugreports.qt.io/browse/QTBUG-42985

I am not sure how to proceed on this. The additional patches seem to
only affect qxcb such that they could only regress !phone apps (e.g.
kubuntu-desktop). They are however numerous making this more work and
more likely to cause regressions in other parts.

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https://bugs.launchpad.net/bugs/1450137

Title:
  Qt5 applications crash when switching screens

Status in qtdeclarative-opensource-src package in Ubuntu:
  Incomplete
Status in qtdeclarative-opensource-src source package in Vivid:
  Confirmed
Status in qtdeclarative-opensource-src source package in Wily:
  Incomplete

Bug description:
  # Impact
  When switching screens (e. g. when putting the laptop onto the docking station the notebook screen is turned off and the external one is turned on) Qt5 applications (including plasmashell) quite often crash.

  # Test Case
  * Have two screens. One plugged-in one not
  * Run plasma 5
  * Plug-in second screen and wait 10 seconds
  * Unplug and wait 10 seconds
  * Plug-in and wait 10 seconds
  * Unplug and wait 10 seconds
  * ...

  # Regression Potential
  Worst case scenario an application using qquickscreen would slow down because of erroneous screen change singals being emitted too often per second. This would however only reveal a lower level issue in the foundations that ultimately needs to be fixed anyway. 

  # Other Info
  The upstream code review [1] explains the issue and solution pretty well.

  https://codereview.qt-project.org/#/c/111100/

  
  --------- original report ---------------

  When switching screens (e. g. when putting the laptop onto the docking
  station the notebook screen is turned off and the external one is
  turned on) Qt5 applications (including plasmashell) quite often crash.
  This makes my laptop unusable, since I do that very frequently.

  The problem has already been described here: https://bugs.kde.org/show_bug.cgi?id=341497
  Apparently it is fixed in Qt 5.5

  I am running Kubuntu 15.04 64bit and libqt5gui5 5.4.1+dfsg-2ubuntu4.

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