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?

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https://bugs.launchpad.net/bugs/1426851

Title:
  Power button shuts down computer if a Qt application is running

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