Comment 144 for bug 19171

I wouldn't bet on it ... PS/2 mice are pretty hard to detect as they aren't PCI,
USB, etc. and have so far just tended to show up across the ISA bridge. This
kind of thing is improving (especially with the serio bus) but we don't actually
do coldplugging of those yet; we'll get that for dapper).

It's not quite there today (mostly our fault, we'd need to update hotplug,
grepmap, etc. and there's no point given we should be throwing both away for
dapper) so psmouse can stay in /etc/modules for breezy and we'll reconsider it
for dapper if we've fixed all the detection bugs.