mplayer configuration question

[Robert Bonomi]

I've got an HP DX5150 with  ATI Radeon X300 on-board graphics. 

'X' start-up indicates ATI R400  drm drivers are active.

I've got both the VGA and DVI-D ports enabled in BIOS, and everthing shows
up just fine on both displays.

EXCEPT for mplayer output, that is.

when I launch mplayer (or gmplayer), I get a new window on both screens,
but _only_ the display on the VGA port has the movie displayed.   on the
DVI port, it's an empty window.

HOW do I get movies to display on the DVI port??

sign me 'baffled'   <wry grin>