> Happened to me too a few days ago when dist-upgrading a Thinkpad x60
> running a sid system. The AC adapter monitoring died too. Seems the
> "battery" and "ac" modules stopped being autoloaded, so I had to add
> them myself to /etc/modules.
>
> I still haven't figured out what's responsible for it, and looking
> through the dpkg log for recently upgraded packages doesn't show any
> immediately obvious suspects.
IIRC there was an update to acpi[d]. The modules you mentioned were
loaded by acpid. The configuration file is /etc/default/acpid but
because acpid does not think about to load the modules, I've putted them
in /etc/modules too.