I have a Microway system based around the Tyan Thunder K8QS Pro
motherboard (4x Opterons).  Under recent versions of 2.6:

2.6.12
2.6.13
2.6.13.3
2.6.14-rc3-rt13

the PS/2-connected keyboard becomes unresponsive once the kernel has
booted (I can use it to select which kernel to boot in grub -- actually,
it must be present to keep the system from whining and asking me to
press F1).  A USB keyboard works (I am composing this message from the
affected machine).  I attempted using earlier versions of the kernel,
but they do not compile before 2.6.12, and if you go far enough back
'make menuconfig' doesn't work (I found and fixed the minor error that
was reported, but haven't attempted to build those kernels again).

However, if I use a kernel built from the Debian source package:

linux-source-2.6.12.tar.bz2

then the keyboard works fine -- I can type on either.  I tried a diff, 
but a 'diff -wurN' resulted in ~133k lines worth of output, and no 
matches on 'keyboard'.

I think I have run into this problem on a home machine, but there
switching to a different PS/2 keyboard fixed things when a kernel
upgrade caused things to cease to function.  And someone installing one
of the Professional Redhat editions had to switch to a USB keyboard as well.

My understanding is that the keyboard should be on IRQ 1, and sure
enough, I don't see it:

             CPU0       CPU1       CPU2       CPU3
    0:       1001        112       1818    5299461    IO-APIC-edge  timer
    7:          0          0          0          0    IO-APIC-edge  parport0
    8:          0          0          0          0    IO-APIC-edge  rtc
    9:          0          0          0          0   IO-APIC-level  acpi
   14:          0          0          0         13    IO-APIC-edge  ide0
169:          0          1         10      13374   IO-APIC-level  megaraid
177:          0          5         29      30231   IO-APIC-level  eth0
193:          0          0          0          0   IO-APIC-level
ohci_hcd:usb1, ohci_hcd:usb2
201:          0         13         34     122802   IO-APIC-level
uhci_hcd:usb3
209:        887         20        114      30151   IO-APIC-level
uhci_hcd:usb4
217:          0          0          0          8   IO-APIC-level
ehci_hcd:usb5
225:          0          0          0          2   IO-APIC-level  ohci1394
NMI:        511        180        246        207
LOC:    5300924    5300846    5300775    5300704
ERR:          0
MIS:          0

for

Linux hydra 2.6.14-rc3-rt13_local_00 #1 SMP PREEMPT Mon Oct 10 15:06:04
MST 2005 x86_64 GNU/Linux.

.config is attached (hopefully).

The keyboard is a Compaq with model number 'KB-9963'.

Help?

-- 
Robert Crocombe
rwcrocombe@raytheon.com

Note: Please CC me, as I am not lkml-subscribed.  Thanks.