[Bug 1061073]

[Wojtask9]

(In reply to comment #16)
> Unfortunately, I can't seem to reproduce this: I also have KDE 4.9.2 and
> Mesa 9.0, but it appears to work fine for me.

My knowledge about mesa and opengl is very limited so sorry about my
terminology.

To reproduce this bug you must use kwin_gles (http://blog.martin-graesslin.com/blog/2011/07/running-kwin-with-opengl-es-2-0/).
Using gentoo try set USE flags "gles -opengl" at kwin package.
With kwin default (i think it is call backend) opengl everything is ok.

Like I said in https://bugs.freedesktop.org/show_bug.cgi?id=55856 this
not happen in mesa-9.0_pre20120918.

Until friday I'm not able to bisect mesa to find a commit that cause regression.
If nobody bisect mesa I will try.

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https://bugs.launchpad.net/bugs/1061073

Title:
  Desktop effects are slow and desktop corruption using mesa 9

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