I have a Thinkpad T42 with a "ATI Mobility FireGL 9000". It has a TV-out port but it doesn't work
out of the box on linux.
I've used the proprietary driver to get that working, but that was too much work. I was using the open source driver on day-by-day basis, and changing to the proprietary driver only when using TV-out. Things got worse when new packages of the proprietary driver came and it stopped working, then I figured out that support for my card was dropped, as it's "too" old.