Command-option-eject key combination results in immediate wake from sleep

Howdy!
After updating to 10.4.9 from 10.4.8 with the Delta PPC updater, my PowerBook 'acquired' the delayed eject key response (i.e., it now has to be held for at least ~0.5 sec to register and to have the eject icon displayed on screen, as opposed to the previous 'tapping-is-sufficient' behavior). Other than learning about the unannounced new behavior the hard way, this is no longer a problem.
At the same time, however, if I put the PB to sleep with the combination command-option-eject it wakes up exactly two seconds after going to sleep (as recorded in system.log). This does not happen if I choose sleep via the Apple menu, or pressing ctrl-eject or the power button.
Usual voodoo - repair permissions, inspect/move login items, safe boot, PRAM and NVRAM resets - already performed, without changing behavior.
Hints? Suggestions?
PowerBook G4 1.67GHz, 1GB RAM, 128MB VRAM, 100GB HDD   Mac OS X (10.4.9)  

The problem seems to have been resolved by upgrading to Leopard. I can now use the combination Option-Command-Eject to pu the PowerBook to sleep and it will stay in that state until woken by pressing any key, or opening the display if it has been closed after the PB went to sleep.
The issue was not answered, anyway, since it was never resolved while the PB had Tiger installed, and after the problem developed. I am choosing this option to simply close it.

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