@mityukov: That's perfectly normal. Video + Compositing hasn't been a problem for a long time (as long as you're usiing Xv), with the exception of fglrx (though I absolutely know I had it working once...). Xv is always rendered indirectly.
For glxgears, I assume it's rendered so often that it 'overwrites' the compositing desktop before you see any flickering. I'm no expert on this though, just guessing. Anyway as you already pointed out it still doesn't get redirected, and with more complex 3d-apps you still see flickering.
Btw, for kde4 users there's a very handy plasmoid called 'toggle compositing' which makes turning compositing on/off very easy.
For glxgears, I assume it's rendered so often that it 'overwrites' the compositing desktop before you see any flickering. I'm no expert on this though, just guessing. Anyway as you already pointed out it still doesn't get redirected, and with more complex 3d-apps you still see flickering.
Btw, for kde4 users there's a very handy plasmoid called 'toggle compositing' which makes turning compositing on/off very easy.
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