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List:       kde-bugs-dist
Subject:    [kwin] [Bug 329979] kwin jerks when new windows are mapped and compositing is on
From:       Martin Gräßlin <mgraesslin () kde ! org>
Date:       2015-01-14 10:59:47
Message-ID: bug-329979-17878-c2swrJcvhZ () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=329979

--- Comment #4 from Martin Gräßlin <mgraesslin@kde.org> ---
Some observations: I can get a short freeze in glxgears whenever I start a Qt 5
application. The freeze doesn't happen if I start the same application as Qt 4
(tested with kwrite and qdbusviewer) and also not with gtk applications (tested
with inkscape).

Furthermore the freeze can be observed with and without compositing and also on
openbox.

As far as my investigations show there is no blocking DBus call involved, also
I'm not seeing any xcb_grab_server - Qt performs a server grab during startup,
but that's not done on a KDE setup.

I couldn't find any further XGrabServer or xcb_grab_server in Qt or KF5 but
will continue investigating.

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