Dual head mode: choppy video playback on only one of my two screens

[runesvend]

Hello

I'm having problems playing back video on my second monitor. My primary monitor is a 21" CRT and I use my flat screen TV as a second monitor. Playing video on my primary monitor works fine, no choppiness. But playing back the same video on the other, flat screen TV, monitor results in choppy video playback. Not constant choppiness, but rather one big chop every 1-2 seconds.

My xorg.conf is attached.

$ lspci | grep ATI
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3870
01:00.1 Audio device: ATI Technologies Inc Radeon HD 3870 Audio device

[powertower]

I'm also having video playback problems with everything from web content to mplayer. Dual monitors enabled with compiz. Same setup at work but with nvidia hardware instaead of ATI and it works fine. Any help would be great.

I have restricted drivers ATI installed.

Ideas???