After several days (and way to many hours) of fighting my PVR 350, I was finally able to get TV out working properly. I used many of the references in this forum, but ran into a couple things not mentioned here that I thought might be worth considering for people struggling.

1) Make sure the card is on its own IRQ. At least with my system, anytime the IRQ used by the PVR 350 was shared I had horrible lockups and my quality was drastically reduced. I disabled my serial and parrell ports in the BIOS, and removed all PCI cards that I did not need. I also played "musical pci slots" shifting the cards around until the PVR350 had its own IRQ.

You can see IRQs with lspci -v

2) Use the driver located at http://membres.lycos.fr/badzzzz/ for TVout in XF86Config-4. This seemed to solve several of my lock ups.

3) Pay attention to what frame buffer you get when you modprobe ivtv-fb. Many of the instructions assume you will be on /dev/fb1, but this was not the case for me. Make the appropriate changes in XF86Config-4 if you are on /dev/fb0.

4) MythTV failed to use /dev/fb0 until after I fixxed the permissions. I think "chmod 666 /dev/fb0" should fix this, since MythTV is a member of the TTY group.

However I still have one problem. I am getting some faint scanning lines on the TV and some faint background noise. I tried using both the S-Video out and the RCA. I even get the slight noise and lines when I'm not playing back TV, so I don't think it is the tuner/encoder. Is there anything I can try and do to reduce this?