As described in another post, trying to boot directly from a MintPPC9.1 install gave me no GUI (although I could SSH into the machine or use the "Linux video=ofonly" option to go to a command line interface only). Adjusting the xorg.conf (attached) allows for a usable GUI on this machine.
Lshw output, xorg.conf, and yaboot.conf are attached.
Yaboot was modified to set the graphics to AGP 2x, which the RAGE 128 onboard (should) support.
Basic tasks work OK, a number of Mint menu items don't work. I had to manually install mouseemu. Wireless with a built-in airport card is not working so far. Wicd can see the wireless interface and AP (WPA encryption), and authenticate, but it hangs on getting an IP address. Google searching shows quite a few cases of this behavior. Altering keymappings with sysctl doesn't seem to work (as noted by ant2ne), but mouseemu is close enough for now. Power saving/sleep/wake is working well.
The interface is a bit slow, especially with Ice Weasel and the system is definitely not up to significant multi-tasking. However, my project was to bring this laptop up to modern wireless security, secure it with some parental controls (probably OpenDNS at least), load up some educational stuff, and let the kids mess with it. I think that is still quite do-able.
The hard drive is original and LOUD! I've picked up a notebook IDE to CF adapter (http://www.addonics.com/products/flash_memory_reader/ad44midecf.asp
) and I'll install that to have a much quieter (and hopefully faster) system when I have time.
I hope this helps!