#779221 qtquickcontrols5-examples: resizing QT window is jerky, redraw/resize problem

Package:
qtquickcontrols5-examples
Source:
qtquickcontrols-opensource-src
Description:
Qt 5 Quick Controls examples
Submitter:
Chris Bainbridge
Date:
2015-02-28 11:21:11 UTC
Severity:
normal
#779221#5
Date:
2015-02-25 17:26:35 UTC
From:
To:
Dear Maintainer,

Run /usr/lib/x86_64-linux-
gnu/qt5/examples/quick/dialogs/systemdialogs/systemdialogs

Drag bottom-right window corner up/down to resize height of window. The window
flickers and redraws with widgets in wrong place. If you go really, really
slowly then this doesn't happen, but drag at a normal speed and it happens.

Tested on both x86 with Radeon and amd64 with Intel graphics (Intel graphics
has TearFree vsync on some this is not the problem)
#779221#10
Date:
2015-02-26 16:13:07 UTC
From:
To:
tag 779221 unreproducible moreinfo
thanks

I can't reproduce this behavior on an Intel card. This normally happens due to
graphic driver's issues, qml tends to find them quite quickly ;)

Do you mind to specify which drivers are you using in each case?
#779221#15
Date:
2015-02-26 16:13:07 UTC
From:
To:
tag 779221 unreproducible moreinfo
thanks

I can't reproduce this behavior on an Intel card. This normally happens due to
graphic driver's issues, qml tends to find them quite quickly ;)

Do you mind to specify which drivers are you using in each case?
#779221#20
Date:
2015-02-28 11:18:59 UTC
From:
To:
due to

Since it appears on both Radeon and Intel on two completely different
systems, it's probably a bug in QT rather than the actual graphics drivers.

I posted screenshots taken during the window resize, the corruption of the
window before repaint is visible: http://imgur.com/a/5AP01

It happens on both XFCE and Gnome, x86-32 and x86-64.
graphics

xserver-xorg-video-radeon-7.5.0
xf86-video-intel-2.99.917

But I do not think this is a specific driver problem, it could be a general
problem with Xorg.