On 14 Aug 2008, at 21:53, Thomas Hilber wrote:

> a good idea, but in the case of 'xserver-xorg-video-ati' true hardware
> double buffers are supported. If a new PutImage() comes in the DDX  
> simply
> toggles to the other double buffer and starts to write there. No  
> matter
> this buffer ever has been completely read by CRT controller.
> So there is no mechanism waiting here for something as far as I can  
> see.

Since you're using the vsync irq in any case, the best solution would  
be to notify user space at irq time that it should 'PutImage' a new  

Torgeir Veimo

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