I just installed Fedora 9 on my 1.2GHz, 1.2GB ram iBook G4 (PPC) and after dealing with a few hurdles, it runs pretty good.
I had the sound problem too, but the worst thing was getting Airport Extreme to work - after trying the fwcutter trick a few different ways and failing, I found an Italian link (currently down, of course)
that gave me the logic to go through it.
- no Linux PPC drivers for my printer, and 'close to my model' drivers don't work
- Emerald loads at the wrong time, and doesn't work flawlessly for me, so I don't use it
- not fedora's fault, but the one button trackpad sucks for right-clicking, so I have a Logitech thumb trackball connected.
- just the fact that the PPC architecture limits the amount of software I can use.
Even so, Fedora 9 runs well enough on the iBook that when it finally dies, I'll buy a $500 Intel-based laptop with Wi-Fi and install Fedora on it.