I'm sure this has been addressed numerous times since day 0, but
why exactly does one of my machines with lpt in the kernel generate
these stray interrupts while the other one doesn't?  (totally different
motherboards)

over a nine day uptime, this stray interrupt has triggered more often
than anything but the serial card.

IRQs    1       3       4       6       7       10      13      14
        2       1137    9882021 1       3820321 1463056 0       1262774

-j