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port-sgimips/47639: O2 keyboard: After a period of light activity, keyboard scrambles

>Number:         47639
>Category:       port-sgimips
>Synopsis:       O2 keyboard: After a period of light activity, keyboard 
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sgimips-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 10 17:55:00 +0000 2013
>Originator:     Rob
>Release:        6.0.1
NetBSD machine 6.0.1 NetBSD 6.0.1 (GENERIC32_IP3x) sgimips
mainbus0 (root): SGI-IP32 [SGI, a], 1 processor
cpu0 at mainbus0: MIPS R12000 CPU (0xe35) Rev. 3.5 with unknown FPC type 
(0x900) Rev. 0.0

After a successful installation with correct keyboard and console function 
(pleasantly fast and felt high quality), observed the keyboard becomes 

Basic services running (NTP, SSH, Postfix, mdnsd). Quiescent system, recently 
installed with 6.0.1. Not running X. 

First observed running top(1) overnight on a quiet system.
Second observed logged into console shortly after boot ~6minutes.
Third observed after physically reconnecting keyboard while logged into console

On the Second occurrence, witnessed flash from CAPS NUM and SCROLL keyboard 
lights. Was not interacting with the machine at that moment. Then observed 
keyboard was corrupted - 'm' became capslock, 'q' became 'Y', other keys could 
produce control key combinations, rendered as garbage in console display.  Some 
key presses repeat randomly.

Remote SSH into machine and observe system is otherwise functioning normally. 

Killed processes attached to console session sh(1) and login(1) and observed 
console return to login prompt. No change in symptoms.

No additional info in dmesg, no log in /var/log/messages.

Unknown how to reinitialize a keyboard.  Reboot and keyboard working normally 
again until next occurrence.

Physically reproduced after boot by unplugging and plugging in keyboard. 
Observed same key-reassignment: "m" capslock, 'g' period 'o' numlock '9' 
scrolllock. Some key reassignments weren't completely the same.

Don't suspect faulty keyboard PS/2 connector. Keyboard is US SGI O2 keyboard 
062-0002-001 circa 1998. Keyboard functions normally in PROM (and in IRIX).

Repeating after obtaining console is inconsistent.

Physically disconnecting the keyboard PS/2 plug, wait a few seconds and then 
reconnect seems to reliably cause fault.  

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