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Date: Thu, 02 Oct 2003 11:17:56 +0200
From: Christoph Sold <cs@cheasy.de>
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To: Alex Wilkinson <alex.wilkinson@dsto.defence.gov.au>
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cc: current@freebsd.org
Subject: Re: kernel: psmintr: out of sync
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Alex Wilkinson wrote:
> Hi all,
> 
> I am switching between several OS's with a Cybex KVW switch.
> I now seem to have a problem with my mouse (after build world/kernel).
> FreeBSD 5.1-CURRENT #2: Wed Aug 20 13:28:54 CST 2003
> 
> I am getting these messages on the console when I move my mouse, the cursor moves in a very
> choppy motion (painfully slow).
> 
> Oct  1 09:46:17 squirm kernel: psmintr: out of sync (0000 != 0008).
> Oct  1 09:46:17 squirm kernel: psmintr: discard a byte (1).
> Oct  1 09:46:17 squirm kernel: psmintr: out of sync (0000 != 0008).
> Oct  1 09:46:17 squirm kernel: psmintr: discard a byte (2).
> Oct  1 09:46:18 squirm kernel: psmintr: out of sync (0000 != 0008).
> Oct  1 09:46:18 squirm kernel: psmintr: discard a byte (3).
> Oct  1 09:46:18 squirm kernel: psmintr: out of sync (0000 != 0008).
> Oct  1 09:46:18 squirm kernel: psmintr: re-enable the mouse.
> Oct  1 09:46:18 squirm kernel: psm: DISABLE_DEV return code:00fa
> Oct  1 09:46:18 squirm kernel: psm: ENABLE_DEV return code:00fa
> Oct  1 09:46:20 squirm kernel: psmintr: out of sync (0000 != 0008).
> 
[snip]

Switching the KVM while the mouse is sending data can cause this 
behaviour. Better KVMs interpret the data sent by the mouse and delay 
switches until a complete mouse output has been sent to the computer.

HTH
-Christoph Sold