Hi,

Does anyone on this list know answers to the following?

The "tearing prevention" option in KWin's Compositor setting has a large effect 
on video playback on my system. The only way I seem to be able to avoid tears 
and partial screen updates are

OpenGL + fullscreen repaints tearing prevention
XRender (+ Automatic tearing prevention)

I presume that "fullscreen repaints" corresponds to the good approach where you 
update an offscreen framebuffer and then swap that with the onscreen buffer 
just before the screen starts to repaint. Normally you shouldn't notice that 
screen refresh rates of 60Hz or better but with KWin there are some artefacts.

I've now gone back to using the XRender backend but I do wonder if that means 
OpenGL isn't being used for anything anymore unless the application asks for it 
explicitly?

Thanks,
R.

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