Hah! I finally found it! It's one of the rt2x00 modules. Adding this
to /etc/modprobe.d/blacklist.conf:
blacklist rt2800pci
blacklist rt2800lib
blacklist rt2x00usb
blacklist rt2x00pci
blacklist rt2x00lib
Allows my laptop to successfully reboot, shutdown, hibernate and sleep.
Looks like maybe
Public bug reported:
I've got Maverick on a Sony Vaio M111AX. In Lucid, I was able to
suspend, hibernate, shutdown and restart. In Maverick I'm not.
Early versions including the Maverick Beta would successfully terminate
my X session, and then init would try to switch runlevels and crash
after
** Attachment added: AcpiTables.txt
https://bugs.launchpad.net/bugs/646547/+attachment/1629980/+files/AcpiTables.txt
** Attachment added: AlsaDevices.txt
https://bugs.launchpad.net/bugs/646547/+attachment/1629981/+files/AlsaDevices.txt
** Attachment added: BootDmesg.txt
