Hardware :: Using The S-video With HVR-1600?

I've been trying to set up my HVR-1600 card with MythTV but have run into a road block. As far as I can tell, the card is setup and the drivers are working properly ( cx18 ). The output of lspci shows:

02:06.0 Multimedia video controller: Conexant Systems, Inc. CX23418 Single-Chip MPEG-2 Encoder with Integrated Analog Video/Broadcast Audio Decoder Unfortunately, I don't seem to be able to change channels when my cable is connected using ivtv-tune no matter what channel or frequency table I try (I live in Canada), though the S-video and audio input seem to work fine (but not through MythTV, see below).

Likewise, when I tried to scan for channels in MythTV, nothing is found, though the same cable plugged into a TV gives just regular cable as it should. since I have digital cable and would like to use the S-video anyway (and the IR blaster when I get that far). But I can't seem to get MythTV to recongize the S-video input. These are my backend settings:

Capture Card Setup:
Card type: IVTV MPEG-2 encoder card
Video device: /dev/video0
Probed Info (Hauppauge HVR-1600 [cx18]
Default Input: S-Video 1

[code]....

I'm not sure if perhaps it's a permission error someone since it works as my own user? It seems very strange. So ultimately it seems I have two main issues:

1. Why can't I configure MythTV to use the S-video input?

2. Why does the MythTV user get errors when trying to use the /dev/video0 device with mplayer? (Remember, cat /dev/video0 > recording.mpg works fine as both MythTV user and my user account)

A few other details:

Ubuntu version: 10.04 64-bit
MythTV version: 0.23.0+fixes24158-0ubuntu2 (from the Ubuntu repository)
Nvidia 9400gt video card (with latest nvidia drivers, 195 I believe)