Re: the impact, I guess it affects users on laptops that regularly (dis)connect external screens (eg. using same laptop at work & home or connecting the laptop to a TV to watch a movie) without shutting down the machine. From the few (<10) Kubuntu 15.04 installations I can be blamed for, I'm the only one who noticed the bug even though I managed to reproduce it on all of them.
Anyway, after reading the qtbugs and trying to cherry-pick a few relevant upstream commits, I think Qt 5.4.1 is a lost cause for this bug at this point, so feel free to postpone/cancel this SRU. As my next steps, I'll try Fedora, and also 5.4.2 & 5.5 on Vivid & Wily to see if I can reproduce it. Will take a few days however. :/ -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to qtdeclarative-opensource- src in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
