QSystemTrayIcon doesn't work correclty on 16.04 final release

[Gaurav Sood]

I created an gui application which uses 'SystemTrayIcon' to put an icon on systemtray. It works correctly when I build application with qt4 irrespective of ubuntu version.

But same application doesn't work when built with qt5. I tested on Ubunutu 15.10 , 16.04 beta2 and 16.04 final releases.
Surprisingly it works on ubuntu 16.04 beta-1 release. I can see the icon on systemtray.

[Dmitry Shachnev (mitya57)]

Thanks for the bug report.

Which desktop do you use? Unity? Do you have appmenu-qt5 package installed?

Can you please run dbus-monitor, then start your application, and paste somewhere the full dbus-monitor log?

[Gaurav Sood (gaurav-sood)]

I have attached the log file for the qt5 case in which icon doesn't appear.

I do have appmenu-qt5 package installed and i am using unity 7.4.0

[Gaurav Sood (gaurav-sood)]

I tried the same application on fedora 23 which have gnome as desktop environment. Its working there.
Something different is happening in unity

[Dmitry Shachnev (mitya57)]

Hi Gaurav,

Does your application use the QSystemTrayIcon::isSystemTrayAvailable() method? If yes, then my appmenu-qt5 fix from lp:~mitya57/appmenu-qt5/lp1574699 should fix this bug. If you can build/install appmenu-qt5 from there and test, that would be nice.

As a workaround, start your app with QT_QPA_PLATFORMTHEME=generic, and it should work.