Jason, does xrandr not allow to disable the tv output? 
So 
xrandr -q 

lists your outputs on the card, eg TV-0, then to disable it:
xrandr --output TV-0 --off 

If this works, you can add it to xorg, see xrandr man and wiki
http://wiki.x.org/wiki/Projects/XRandR

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[RV250] Kubuntu: X Freezes with Radeon driver EXA/XAA Composite
https://bugs.launchpad.net/bugs/348332
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