pbbuttonsd won't sleep on 2.6.8

[Frank Murphy <murphyf+deb-ppc@f-m.fm>]

When I close the lid of my clamshell G3 iBook, the system doesn't properly 
sleep like it does on 2.4.25. I've tried it with pmud and pbbuttonsd, and in 
both cases the screen backlight stays lit. On 2.4.25, I configured pbbuttonsd 
to sleep when the power button is pressed, and screen shows some psychadelic 
colors then turns off. On 2.6.8, X stops and some logs messages are printed 
on vt7, but the screen doesn't actually turn off. I have apm_emu loaded 
via /etc/modules. Is there something obvious I'm missing?

Frank