How do I sync output changes to vertical retrace?

Barry Scott <[email protected]>
Newsgroups gmane.comp.xfree86.devel
Message-ID <[email protected]> 
I have a text scrolling app that is not playing smoothly.

Attempting to update the windows on a timer is not keeping my changes in
sync with the monitors refresh. This is causing visual glitches.

What mechanisms can I use to lock my changes to the monitor refresh rate?
If I use DBE is it going to change the screen in the vertical blanking 
interval?

Barry
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