Bands in Fullscreen SDL

[James Umbanhowar <james.umbanhowar@myrealbox.com>]

Hi,
When I try to run xmame or nceu (Nintendo emulator) in fullscreen mode 
through SDL I get weird vertical bands of my X background on the 
screen.  This doesn't happen when I run mame with the x11 fullscreen, 
but this is not available in nceu. 
I can get around the problem by setting SDL_VIDEODRIVER="dga", but this 
only works as root.
I'm running debian-unstable.