r500 tv-out?

[tommy jumps]

Hi,
  I read the following about tv-out on r500
http://www.phoronix.com/scan.php?page=news_item&px=NjI2NQ and decided to buy
an r500 based card for my mythbox (
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102080 ) upon
pluggin it in I have since discovered that it doesn't quite work as planned
;-)
 I have noticed there is a little tug of war going on in git and have
disabled this commit
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-ati.git;a=commit;h=effa245914823371e052cd9aa1143a02350891e7and
xrandr now sees my s-video out

S-video connected 800x600+0+0 (normal left inverted right) 0mm x 0mm
        tv_standard: ntsc
    load_detection: 1 (0x00000001) range:  (0,1)
   800x600        59.9*+   60.3
   720x600        59.7
   640x600        59.9

but my screen remains blank. Is there anything I can do about this?

Cheers,
  Tom.
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