I have found the Cybex brand of KVM's work best... most specifically the
Command 1xp/4xp or XP4xxx series.
Most other KVM's don't present the proper keyboard responses for an
RS/6000 (running AIX - as we found the same problem with Motorola
PPC hardware ONCE AIX was running but not in boot-monitor mode)
I've encountered a keyboard lockup when using WindowMaker 0.14 on
XFree86 3.3.2 on RedHat 4.2 (kernel 2.0.33) on Dell OptiPlex GXa (PII
266MHz, 64M Ram, ATI Rage Pro 4M Ram). No response to unlock my
xscreensaver-2.16 by typing password. After I've killed my window
manager, no response on keyboard is also encountered. After I killed the
X server, same result is obtained. Finally, I reboot my system and
everything goes right. What's the cause of the lockup? (I have a PS/2
keyboard and mouse).