Re: Component out produces garbled screen
I have a few questions:
0) Are you able to capture the corruption in a screenshot?
1) Are you using a composite cable directly between the TV & videocard, with no intermediary converters or devices?
2) Have you tried using a component cable instead? I don't believe that composite cables are capable of doing much more than 800x600 without severe signal degradation (similar to what you're reporting).
3) Have you tried setting the TVStandard option?
With respect to your 2nd problem, the permitted TV modes have always been fixed, however this wasn't explicitly logged until recent drivers.