weird keyboard issue (ps/2 port?) 3.9.x/3.10.x?

[Udo van den Heuvel]

Hello,

I am stuck with a weird keyboard related issue:
Since a few weeks I see loads of ^@^@^@^@^@^@ appear on the text console
while the PC_speaker beeps when this box is in runlevel 3.
When xorg is running the ^@^@^@ stream stops, as does the beeping, but I
can notice that selecting text, scrolling xterminals with the mouse are
interrupted by these characters appearing. (but not printing)

Removing/replacing the ps/2 keyboard does not help.
Rebooting does help for a while.

The hardware is a Gigabyte F2A85X-UP4, BIOS F5a 04/30/2013.
I replaced the board last weekend by a brand new F2A85X-UP4 with same
BIOS F5a but the problem persists.

What could this be?
Is it really a software issue?
If so: how could I help fix this?

Kind regards,
Udo
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