Power button shuts down computer if a Qt application is running

[Neptilo]

On Ubuntu 14.04, the usual behavior of the power button is bringing a dialog with options (Lock, Suspend, Restart, Shutdown) and waiting for the user's choice.

When a Qt application is running, for instance Qt Creator or Texmaker, (but not VLC, Clementine or Skype) and the power button is pressed, it instantly closes that Qt app (http://qt-project.org/forums/viewthread/47632/), brings the shut down dialog and then shuts down the computer without waiting for the user’s choice.

I first asked about this on this forum: http://qt-project.org/forums/viewthread/53243/#222409
and reported it at Qt Creator, thinking it was the only application causing it, where they told me to report it to Canonical: https://bugreports.qt.io/browse/QTCREATORBUG-14030

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[Brian Murray (brian-murray)]

I was unable to recreate this on Vivid. After launching qtcreator, I held down the power button and while qtcreator did close itself, I was presented with the lock / suspend / restart / shutdown dialog and it did *NOT* automatically shutdown on me.

[Sebastien Bacher (seb128)]

Thanks, I see the same behaviour that Brian here, qtcreator closes and the power dialog is displayed but not action is validated

[Sebastien Bacher (seb128)]

The "close the application" is not specific to qtcreator, other qt5 code does the same, likely a qtdeclarative thing. Unsure what's going on with the session closing for you though, it's only doing it when qt code is focussed? having a xev log could be useful

[Sebastien Bacher (seb128)]

unassigning as well, it's not something obvious/that most users see, not likely to be worked on by our team in the near futur either

[Neptilo (neptilo)]

Sebastien, not sure what you mean by "when qt code is focussed". If you mean when a Qt window is focussed, I think the answer is no. It is doing it when a Qt application is running, whether it has a window focussed or not.

I don't know what a xev log is. I'm going to look it up and send the result when I find how to do it.

[Neptilo (neptilo)]

OK, xev is actually pretty easy to use. Here is my log: http://pastebin.com/Gef6zmeY

I first tried (several times) launching Texmaker and press the power button but the problem didn't happen.

What seemed to make a difference is creating a new document after launching it. Then I started xev, then pressed the power button and the computer shut down.

Maybe this is happening when there are unsaved changes to a document in the Qt application. Can you recreate the bug after creating a new document without saving it?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Eduards Bezverhijs (mjasnik)]

The same behavior on 14.04 and 15.04 - if QT app is open, all windows for it are closed, like Keepassx, skype, WPS office asks whether to save the contents of documents (this kinda seems like pressing Alt+F4).

14.10, which was troublesome to use for me so I don't use it, didn't have this problem.

I'm running Dell, XPS 15 L521X model, can't verify on any other computer.