[CentOS] dirty screen

Thu Jan 13 17:54:14 UTC 2011
Jerry Geis <geisj at pagestation.com>

Is there a command that marks the screen as "dirty" and hopefully 
redraws it?

If I do a control ALT F1 and the F7 this in effect redraws the screen.
I am getting video artifacts that I think is in the nvidia driver.
the switching console works - I was just hoping there is a more 
convenient way.
some command or something.