qtbase-opensource-src (5.5.1+dfsg-6ubuntu3) xenial; urgency=medium
* debian/patches/enable-tests.patch:
- Replace the non-DFSG-free RFC files with public domain content.
- Adjust tests to the new files.
(LP: #1522442)
* debian/copyright: mention the replacement.
* Switch to
FWIW, the screen switching problems are quite spread to a lot of smaller
bugs, which explains why Qt 5.4.2 did not fix everything.
For example, these bugs exist in upstream tracker:
https://bugreports.qt.io/browse/QTBUG-46024
https://bugreports.qt.io/browse/QTBUG-42985
Still getting krunner crashes when switching screens on Willy with Qt.
5.4.2.
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https://bugs.launchpad.net/bugs/1450137
Title:
Qt5
Hi Nuno,
Qt 5.4.2 is not just a small bugfix release, so it does not fall under
Stable Release Updates guidelines
(https://wiki.ubuntu.com/StableReleaseUpdates).
So unfortunately I don't think the bug is going to be fixed there unless
someone identifies the exact patches needed to fix the issue
Hi Timo,
Any chance 5.4.2 is backported to vivid?
It is good that the bug is fixed on 15.10, but for the last released version
(15.04) the bug is still there.
Best regards,
Nuno Carvalho
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I cannot use Willy at the moment, but some other user on Arch Linux found out
that the workaround in Qt 5.4.2 isn't fixing all crashes, I hope someone can
confirm this.
https://bugs.archlinux.org/task/43986
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I guess that this is the same bug as:
https://bugs.kde.org/show_bug.cgi?id=349197
A developer at bugs.kde.org claims that this bug was fixed in Qt version
5.4.2 and I got the advice to upgrade from Qt version 5.4.1 to version
5.4.2. Is there a PPA with Qt 5.4.2 for (K)Ubuntu 15.04 or another
Unfortunately there's no Qt 5.4.2 PPA for 15.04, and no backportable
commits have been found that would actually fix the problem.
However, as of an hour ago 15.10 now has Qt 5.4.2, so marking this bug
as fixed even though the bug number was not included in the bug report.
Testing whether Qt 5.4.2
s/in the bug report/in the changelog/
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Title:
Qt5 applications crash when switching screens
Silo 002 with the not so complete fix was no freed to be reused for
other purposes. I made a backup of the package to https://launchpad.net
/~timo-jyrinki/+archive/ubuntu/ppa/+packages though.
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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
The bug https://bugs.kde.org/show_bug.cgi?id=345544 linked from
https://bugreports.qt.io/browse/QTBUG-45753 (linked from
https://codereview.qt-project.org/#/c/00/) has a claim from Stefan
that he doesn't see a particular crash anymore with Fedora's patched Qt.
The only relevant patch in that
I managed to get backtraces out of Konsole Plasma, excuse the poor
quality of them as I only remembered to log output after I started gdb.
In all 3 cases they're now crashing in QScreen::handle() with
(this=this@entry=0x0) .
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** Attachment added: Plasmashell crash backtrace with patched Qt
https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+attachment/4396143/+files/plasmashell.qtdeclarative_ubuntu8.crash
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** Attachment added: Konsole crash backtrace with patched Qt
https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+attachment/4396144/+files/konsole.qtdeclarative_ubuntu8.crash
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I think it starts to sound like it would be useful to land this fix in
wily to get also more exposure to the fix, but maybe not worth starting
an SRU at this point. The impact seems to be either a) low or b) a bit
unpredictable on the actual problem users are seeing. If it turns out we
can get
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
I did a few tests:
On the first reboot after installing qtdeclarative from the Wily PPA on
Vivid, I probably got lucky and managed to plug/unplug the external
monitor 4 times before the first crash (nvidia-340's xrandr also stopped
detecting changes for the next 2 topology changes at that point,
** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
Status: Confirmed = In Progress
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Can anyone test on wily (or just add the PPA for wily on vivid) with the
5.4.1-1ubuntu8 version from https://launchpad.net/~ci-train-ppa-
service/+archive/ubuntu/landing-002 ?
I still get a crash of Qt Creator when plugging/unplugging with the
patch included. Does it improve the situation for
** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
Status: In Progress = Incomplete
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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
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: qtbase-opensource-src (Ubuntu)
Status: New = Confirmed
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This has affected all Plasma 5 releases in Kubuntu since Utopic,
including the current backport of Plasma 5.3.
It reliably triggers a cascade of crashes in at least krunner, plasma
and kwin on every screen topology change, making for a very
disconcerting user experience.
Please consider
** No longer affects: plasma-workspace (Ubuntu)
** No longer affects: kwin (Ubuntu)
** Package changed: qtbase-opensource-src (Ubuntu) = qtdeclarative-
opensource-src (Ubuntu)
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There's another qtdeclarative landing pending to go to wily. Then this'd
go into wily, and then a backport of this to vivid. It will take some
time.
** Also affects: qtdeclarative-opensource-src (Ubuntu Vivid)
Importance: Undecided
Status: New
** Changed in:
** Description changed:
+ # 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
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