Thinkcentre S51 (i386) kbd/mouse fail w/netbsd-8, native Xorg

["John D. Baker" <jdbaker%consolidated.net@localhost>]

I have a couple of IBM Thinkcentre compact desktop machines (S51) which
run NetBSD/i386.  Both boot -current (netboot/NFS root) and run native
Xorg just fine.

Only one has a local disk and ran NetBSD-7 with no problem.  When I
updated it to netbsd-8 (first 8.0_RC2 and now a recent 8.0_STABLE),
during Xorg startup (via xdm), the keyboard lights blink very quickly
a few times, the X server and xdm take a long time to start, and the
keyboard and mouse become completely unresponsive.  The machine is using
a genuine IBM model M keyboard and a fairly recent PS/2 mouse (by m$,
OEMed for DELL).

I could still log in via SSH and when shutting down saw the following
on the console (later extracted from 'dmesg' output):

pckbport: command timeout
pms_enable: command error 35
pckbport: command timeout
pckbport: command timeout
pms_disable: command error
pckbport: command timeout
pms_enable: command error 35
pckbport: command timeout
pms_disable: command error
pckbport: command timeout
pms_enable: command error 35

Again, this only occurs on this machine under netbsd-8.  Other i386
boxen run netbsd-8 with native Xorg and PS/2 keyboards/mice just fine.
Other machines use the same PS/2 keyboard/mouse as this machine without
problems.  This same machine runs -current w/native Xorg just fine.

Full netbsd-8 dmesg available when I get it set up again (workspace
occupied by another task at the moment...).

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