All QSystemTrayIcon have the same icon, and QSystemTrayIcon::isSystemTrayAvailable remove all QSystemTrayIcon

Bug #1574699 reported by ogoffart on 2016-04-25
This bug affects 20 people
Affects Status Importance Assigned to Milestone
appmenu-qt5 (Ubuntu)
Dmitry Shachnev

Bug Description

# Impact
This affects all Qt applications that use QSystemTrayIcon::​isSystemTrayAvailable, in Unity environment. Confirmed examples are owncloud-client and keepassxc, but there may be more applications.

# Test Case
See the original description below for the test case in C++.

# Proposed Fix
The proposed fix is identical to what was uploaded to Yakkety as version 0.3.0+16.10.20160628.1-0ubuntu1. The fix is using unique connections for all AppMenuPlatformSystemTrayIcon instances.

# Regression Potential
The fix is in Yakkety since June and in Zesty, and nobody complained so far. So it should not cause any regressions.

in appmenu-qt5 in ubuntu 16.04, the AppMenuPlatformSystemTrayIcon assumes there is only one instance of a QPlatformSystemTrayIcon: it register the same dbus name for all the instances. In fact, there is one instance of QPlatformSystemTrayIcon per instance of QSystemTrayIcon, and one temporary is created for QSystemTrayIcon::isSystemTrayAvailable.

This breaks the owncloud client [issue ]

This example reproduces the problem:

#include <QtWidgets>

int main(int argc, char *argv[])
    QApplication a(argc, argv);
    QImage img(64,64, QImage::Format_ARGB32);
    QSystemTrayIcon sti(QIcon(QPixmap::fromImage(img)));;

     QSystemTrayIcon::isSystemTrayAvailable(); // with this line, the QSystemTrayIcon does not appear
     // comment the previous line to see that the QSystemTrayIcon works and that there is a bug in that line

    return a.exec();

This testcase shows that the AppMenuPlatformSystemTrayIcon::~AppMenuPlatformSystemTrayIcon called by the temporary object created inside QSystemTrayIcon::isSystemTrayAvailable unregisters the icon.

Related branches

Dmitry Shachnev (mitya57) wrote :

Anatoli: if the fix in the linked branch (also present in Ubuntu 16.10) works for you, I can backport it to Ubuntu 16.04 too.

Anatoli (anatoli) wrote :

Dmitry, just seen your answer. Is there any way to install the version with the fix without updating the entire QT5 stack (the version from 16.10 depends on a number of QT5 libs v5.6.1, but 16.04 ships v5.5.1)?

I could install it from your PPA if you add the fixed version there, without the higher version dependency for other libs.

Dmitry Shachnev (mitya57) wrote :
Anatoli (anatoli) wrote :

Dmitry, just tried it and it works perfectly!

Could you please also check the bugs #1313248 and #1380702 as they seem related?

Dmitry Shachnev (mitya57) wrote :

> Dmitry, just tried it and it works perfectly!

OK, starting the stable release upload procedure then.

> Could you please also check the bugs #1313248 and #1380702 as they seem related?

They are not related, but a fix will be available in the next upload (first in 17.04, then can be backported to 16.04 if it works).

Changed in appmenu-qt5 (Ubuntu):
status: New → Fix Released
Changed in appmenu-qt5 (Ubuntu Xenial):
assignee: nobody → Dmitry Shachnev (mitya57)
status: New → In Progress
description: updated

Hello ogoffart, or anyone else affected,

Accepted appmenu-qt5 into xenial-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at . Thank you in advance!

Changed in appmenu-qt5 (Ubuntu Xenial):
status: In Progress → Fix Committed
tags: added: verification-needed
Anatoli (anatoli) wrote :

Brian, I just updated the package from xenial-proposed (appmenu-qt5/xenial-proposed,now 0.3.0+16.04.20151130-0ubuntu2 amd64). This bug is fixed. No other issues detected.

Dmitry Shachnev (mitya57) wrote :

Marking verification-done based on comment #8 and my own testing in

tags: added: verification-done
removed: verification-needed
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package appmenu-qt5 - 0.3.0+16.04.20151130-0ubuntu2

appmenu-qt5 (0.3.0+16.04.20151130-0ubuntu2) xenial; urgency=medium

  * Fix for creating two or more system tray icons (LP: #1574699).

 -- Dmitry Shachnev <email address hidden> Wed, 25 Jan 2017 22:52:49 +0300

Changed in appmenu-qt5 (Ubuntu Xenial):
status: Fix Committed → Fix Released

The verification of the Stable Release Update for appmenu-qt5 has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

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