This bug was fixed in the package qtbase-opensource-src - 5.5.1+dfsg-
14ubuntu2
---------------
qtbase-opensource-src (5.5.1+dfsg-14ubuntu2) xenial; urgency=medium
* debian/patches/enable-tests.patch: some qnetworkcookiejar tests have
started failing without any Qt changes (LP: #1548686)
* Notify-when-the-primary-screen-changes.patch
xcb-Handle-screen-siblings-in-QXcbVirtualDesktop.patch
xcb-Use-a-placeholder-QScreen-when-there-are-no-outp.patch:
- Another multi-monitor crasher fix and its pre-requirement patches
(LP: #1548766)
- Rebase the patches slightly to apply to Qt 5.5.
* Merge with unreleased Debian's 5.5.1+dfsg-15
-- Timo Jyrinki <timo-jyri...@ubuntu.com> Fri, 26 Feb 2016 07:03:24
+0000
** Changed in: qtbase-opensource-src (Ubuntu)
Status: In Progress => Fix Released
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Ubuntu.
https://bugs.launchpad.net/bugs/1548766
Title:
Plasma crashes when the monitor is disconnected (when it sleeps, in
some cases)
Status in qtbase-opensource-src package in Ubuntu:
Fix Released
Bug description:
I'm reporting this on behalf of a coworker who has a 4K monitor, which
disconnects whenever it sleeps. Older monitors didn't do that; but Qt
5.5 tries to be honest about it: the QScreen is destroyed whenever its
corresponding monitor is disconnected,
QGuiApplication::primaryScreen() returns null, and so on. KDE
developers have been complaining. So in Qt 5.6 we made it keep the
last-remaining QScreen as a fake instance, whenever the last monitor
is disconnected. The main patch is here
https://codereview.qt-project.org/#/c/138201/
You might need to cherry-pick that
(a094af001795c9651b299d700a992150d1aba33a in qtbase) for as long as
you are shipping Qt 5.5, to get Kubuntu behaving decently. It's
relevant on Ubuntu 16.04. Too bad that Ubuntu LTS is not shipping the
LTS Qt 5.6 release, but I know we are behind on our release schedule.
Some users have also reported that their laptop's screen disconnects
when it sleeps. And I have often experienced 5.5-based builds of
Creator crashing or disappearing when I switch machines on my KVM.
So, sorry that we didn't fix it sooner. It was my mistake for
believing that modeling disappearing screens "correctly" was a good
idea: it turned out to be a platform inconsistency which developers
were not ready for.
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