I'm not sure exactly what changes caused this, maybe a kernel upgrade or something like that, it started to happen in Dapper and continued in Edgy.
** Attachment added: "acpi data from edgy" http://librarian.launchpad.net/5050265/acpi-edgy.tar.gz -- Battery consumption running rampant .... https://launchpad.net/bugs/70502 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs