From owner-freebsd-usb@FreeBSD.ORG  Fri Mar 18 16:57:09 2011
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Date: Fri, 18 Mar 2011 10:46:58 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Alexander Best <arundel@freebsd.org>
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	(wonkity.com [127.0.0.1]); Fri, 18 Mar 2011 10:46:58 -0600 (MDT)
Cc: Anonymous <swell.k@gmail.com>, freebsd-usb@freebsd.org
Subject: Re: Problem with mouse during high CPU load
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On Fri, 18 Mar 2011, Alexander Best wrote:

> On Fri Mar 18 11, Anonymous wrote:
>> Alexander Best <arundel@freebsd.org> writes:
>>
>>> i've reported this issue quite a while ago [1], but back then nobody was able
>>> to help me. i have an issue with my usb mouse. when there's a high CPU load it
>>> produces random mouse clicks. this doesn't happen on other OSes. i've attached
>>> a different usb mouse to my freebsd box and i could't observe the same
>>> behavior. so it seems this problem is only related to specific mice.
>>
>> I'm curious, can you reproduce it without moused(8), i.e. specifying
>> /dev/umsN in xorg.conf rather than /dev/sysmouse.
>
> wow that worked. :)
>
> i've set my mouse to /dev/ums0 and set Option "AllowEmptyInput" "off", because
> without that line i couldn't use the mouse.

Please use Option "AutoAddDevices" "Off" if you want to disable hal 
hotplugging in xorg.conf: http://www.wonkity.com/~wblock/docs/html/aei.html

> even with very fast movements i don't get any random clicks anymore. although
> this a solution works for X, for the console the only way to use a mouse is
> moused(8).

Yes, but moused is autostarted for USB mice by
moused_nondefault_enable="YES" in /etc/defaults/rc.conf.