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PS2 Linux Problems
You do need to hold a key combo as you boot to enable TV output, but I don't know what it is.. I'm quite interested in trying PS2 Linux and have done a great deal of research, but I still lack the RTE disc. If I were to come across a copy of it somehow, I'm sure I'd be able to provide any information necessary...
Hold down one of these key combos on startup and it should work.
Video mode Key combination
VGA Select + L1
NTSC Select + R1
PAL Select + R2
This is from the PS2 Linux page, it also provides additional info on how to configure PAL/NTSC output.