Maybe direct a virtual serial port to a telnet port in QEMU, use
`telnet` within `script` to log everything seen there and tell OpenBSD
to use serial console on aforementioned serial port?
That might give us a `dmesg` dump to work with at least. If it really
is interaction with the video console that causes it, maybe pressing
some keys on said console will trigger it with the log messages going to
the virtual serial port?
Stuart Longland (aka Redhatter, VK4MSL)
I haven't lost my mind...
...it's backed up on a tape somewhere.