Also, I found this Gentoo thread which has more information from a Powerbook user with the same symptoms:
http://forums-web1.gentoo.org/viewtopic-p-7287520.html?sid=a46c2fb8585d51177fc433483d75cfd1 --Dan -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org