X to TV

[Grant]

I'm planning to use my standard definition TV with MythTV and I have
this device to convert VGA to component:

http://mythic.tv/product_info.php?products_id=30

I'm using the modeline from this link:

http://www.sput.nl/hardware/tv-x.html

and my xorg.conf looks like this:

Section "Monitor"
       Identifier "monitor1"
       Modeline "736x485i" 14.16 736 760 824 904 485 491 496 525
interlace -hsync -vsync
EndSection

Section "Device"
       Identifier "device1"
       Driver "i810"
       VideoRam 4096
EndSection

Section "Screen"
       Identifier "screen1"
       Device "device1"
       Monitor "monitor1"
EndSection

Section "ServerLayout"
       Identifier "layout1"
       Screen "screen1"
       InputDevice "mouse1" "CorePointer"
       InputDevice "keyboard1" "CoreKeyboard"
EndSection

When I try to open an xfce4 desktop like this, the image is somewhat
scrambled and constantly rolls on the TV.  It looks normal on a
monitor with the same settings.

/var/log/Xorg.0.log reports this:

(II) I810(0): monitor1: Using default hsync range of 28.00-33.00 kHz
(II) I810(0): monitor1: Using default vrefresh range of 43.00-72.00 Hz
(II) I810(0): Clock range:   9.50 to 163.00 MHz
(II) I810(0): Not using mode "736x485i" (unknown reason)
(II) I810(0): Not using default mode "640x350" (hsync out of range)
(II) I810(0): Not using default mode "320x175" (bad mode
clock/interlace/doublescan)

It continues through a long list of "Not using" resolutions, and then:

(--) I810(0): Virtual size is 640x480 (pitch 640)
(**) I810(0): *Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(II) I810(0): Modeline "640x480"   25.20  640 656 752 800  480 490 492
525 -hsync -vsync

I've tried the 640x480i modeline from the above link with the same results.

What do you guys think?

- Grant