I am running Karmic, and on the rare occasions when I have to reboot, my machine
boots up to the Keyring login window, and sits there waiting for my password.
The problem is that it may take as long a 5 minutes before my keyboard and mouse
start to function. They are both plugged into USB ports on the MB (but the
problem also occurs when they are plugged into a port on a USB I/O card). There
is not a lot of disk activity during the wait period. Once the devices start
working, everything is fine until I have to reboot.

Any thoughts (besides 10.10)?