[Nouveau] [Bug 21257] New: Qt applications strange behavior

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21257

           Summary: Qt applications strange behavior
           Product: xorg
           Version: 7.4
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: luizluca at gmail.com
         QAContact: xorg-team at lists.x.org


Hello,

I'm having a problem with Qt applications and nouveau. I filled a bug in kde
(4.2.2) for some drawing problems. However, as it occurs also with virtualbox,
I think this might be related to nouveau with Qt.

I use updated nouveau git + drm git without 3d. Alfter some time, plasma and
virtualbox, independently, stops to draw some parts randomly. For example, when
I pass the mouse over icons, they disapear and reapear (maybe reapers using
cache image).

If I kill plasma or vbox and open it again, it works for some time before the
same problem reocurs. This happens also with other kde aplications like
kterminal.

I also tested with nv without being able to reproduce the problem.

For plasma I got a lot of this error:

QPainter::begin: Paint device returned engine == 0, type: 3                     
QPainter::setCompositionMode: Painter not active    
QPainter::end: Painter not active, aborted                                      

I also reported this in:
https://bugs.kde.org/show_bug.cgi?id=189059

PS: I'm not attaching the kernel log as it has only the normal startup info.
Do I need to attach "drm+debug" ?


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