Hello all, hello Ben, I've been able to see that sleep now works on iBook G4 - resume works too with a garbled screen. I had Ben's albook_sleep patch applied, plus my patch to fix the blanking corruption, plus I had added PMAC_MB_CAN_SLEEP to my "PowerBook6,3" structure - and then stopped there... Until yesterday evening where I ran out of battery and the laptop went to sleep.
Upon resume, the screen is garbled in a different way than the "blanking corruption" (which displays colorful, slowly-moving junk): there are some pixels of the correct color displayed, but randomly, like a clock problem. It looks like I'm going to waste my Sunday trying to make it work by try-and-error :) -- Colin