touch-packages team mailing list archive

[Timo Jyrinki <timo.jyrinki@xxxxxxxxxxxxx>]

Yes, you're correct even though I meant the (positive) impact of landing
the current fix being low :)

I agree about canceling the SRU at least for now. Qt 5.5 will have the
fix in wily eventually, but if there's something to be done with the 5.4
series that seriously improves the situation we can come back to
considering vivid.

Qt 5.5 alpha for vivid is partially at https://launchpad.net/~ci-train-
ppa-service/+archive/ubuntu/landing-012/ but not enough to run Plasma 5
(Unity 8 ok). I'll build beta just being released for wily in the same
PPA.

** No longer affects: qtdeclarative-opensource-src (Ubuntu Vivid)

** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
       Status: Incomplete => Confirmed

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You received this bug notification because you are a member of Ubuntu
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src in Ubuntu.
https://bugs.launchpad.net/bugs/1450137

Title:
  Qt5 applications crash when switching screens

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

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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