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List:       kwin
Subject:    [Bug 201912] New: screen corruption when using effects (OpenGL and
From:       Radu Benea <radub82 () gmail ! com>
Date:       2009-07-29 16:37:29
Message-ID: bug-201912-4790 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=201912

           Summary: screen corruption when using effects (OpenGL and
                    XRender)
           Product: kwin
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kwin@kde.org
        ReportedBy: radub82@gmail.com


Version:           4.3.00 (KDE 4.3.0) (using Devel)
Compiler:          gcc (Gentoo 4.3.3-r2 p1.2, pie-10.1.5) 4.3.3

OS:                Linux
Installed from:    Compiled sources

Happens to me here with KDE Version 4.3.00 (KDE 4.3.0) (svn 4.3 branch) and
Gábor Lehel <illissius` on irc> which uses trunk.

Doesn't happen only to decorations but other windows as well, like in the
screenshot at http://www.imagebin.ca/view/3pdvDd.html
I can make more screenshots if needed but they all look very similar, although
sometimes nothing at all is rendered and plasma from below can be seen instead
of the missing portion, but when that happens and I run ksnapshot, the window
is re-rendered correctly before the screenshot is taken.

This is quite hard to reproduce under normal conditions but I found that it
happens a lot more when the system is under heavy load (at mine it started
happening much more when the load factor was greater than 2) and when
notifications keep arriving while switching desktops or moving around windows.

Another observation is that I never noticed this for small windows (less than
half my screen size).

This seems to be related to desktop effects and I could very easily reproduce
it with both OpenGL an XRender and gave up after 10 minutes trying to reproduce
it without effects. ( while trying to reproduce I kept my system under a
average load of approx 6 and made sure I will get many notifications during
this time )

Before you dismiss this as a driver or X problem please take into consideration
that I use an ati (r300) card with radeon driver while Gábor Lehel uses an
intel card as for X mine is 1.6.2 and his 1.5.2, also we both started
experiencing this after updating kwin from svn recently, and this did not
happen before.

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