Keyboard trouble with 2.5.8-pre2: missed interrupt?

I've been having keyboard troubles on my Athlon box with recent kernels, and I've traced it to a problem with interrupts.  In kernel 2.4.x, the function handle_kbd_event() does not find a full input buffer when it is first called (status = 0x14).  However, when the keyboard controller interrupt calls it, it (logically, since it was from the interrupt) finds 0x15 in the status register.  Howerver, in 2.5.8-pre2 (and presumably others), the keyboard interrupt is only caught once, before the first send_data function is called.  I can't offer any reasons as to why that may be, since I don't see much change related to the keyboard interrupt in drivers/char/pc_keyb.c, but that is what I've traced it to.  If you have any help, please CC me directly, since I'm no longer on the list.