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I have been experiencing a strange graphical bug which I'd like to report on Launchpad.

The bug occurs randomly when pressing mouse buttons in some applications, like for example when I resize tables in Libreoffice Writer or when I use autoscroll in Firefox. When a mouse button is pressed, a black screen is displayed or sometimes the login...The bug is transient: it disappears as soon as the mouse button is released!

I'm basically facing 3 problems before I can report it:

  • I don't know how to reproduce it
  • I don't know which package is faulty (hardware driver?xorg?unity?, etc)
  • I don't know how to show evidence of it! A screenshot cannot capture it...

This is really annoying and I would really like to report this bug so it can be solved.

Please help me!

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1 Answer

Launch the application from the command line. Look for error messages, try to reproduce the crash.

You can also use apport and/or apport-retrace

enter image description here

See also https://wiki.ubuntu.com/DebuggingProgramCrash

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perhaps you haven't read my post well. I do not know what application is causing the bug (probably an underlying process of the gnome graphical interface) and there is no crash whatsoever which would require the use of apport. –  R Pennese Mar 15 '13 at 22:08
    
You said the crash occurs when running Libreoffice Writer. So first run Libreoffice Writer from the command line and look for errors. If there are none, run apport-retrace right after the crash. See the link I gave you for more information. Post back if that does not work. –  bodhi.zazen Mar 15 '13 at 22:12
    
I edited the description since it seemed to be confusing. I repeat that there is NO crash, the applications keep running but the display is interrupted by black screens whenever the mouse is pressed. I will try to record a video next time it happens. How do I know if it's the X server, unity, compiz or whatever else that is faulty? –  R Pennese Mar 16 '13 at 16:28
    
Try working your way through the debugging X wiki - wiki.ubuntu.com/X/Debugging –  bodhi.zazen Mar 16 '13 at 17:10
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