From owner-freebsd-x11@FreeBSD.ORG  Wed Jul 20 01:21:21 2011
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Date: Tue, 19 Jul 2011 19:21:20 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Mario Sergio Fujikawa Ferreira <lioux@freebsd.org>
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	(wonkity.com [127.0.0.1]); Tue, 19 Jul 2011 19:21:20 -0600 (MDT)
Cc: freebsd-x11@freebsd.org
Subject: Re: ports/131124: x11/xorg - New xorg 7.4 hangs until mouse is moved
 when AllowEmptyInput
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On Wed, 20 Jul 2011, Mario Sergio Fujikawa Ferreira wrote:

> The following reply was made to PR ports/131124; it has been noted by GNATS.
>
> From: Mario Sergio Fujikawa Ferreira <lioux@FreeBSD.org>
> To: bug-followup@FreeBSD.org
> Cc: xelah-freebsd-pr@xelah.com
> Subject: Re: ports/131124: x11/xorg - New xorg 7.4 hangs until mouse is moved
> when AllowEmptyInput
> Date: Tue, 19 Jul 2011 22:04:24 -0300
>
> Hi,
>
> 	I would like to verify that this still occurs with latest
> ports under FreeBSD 8.2:
>
> - xorg 7.5.1
> - kde 4.6.5
> - hal 0.5.4
>
> 	Logitech trackball:
>
> ums0: <Logitech USB Receiver, class 0/0, rev 1.10/15.00, addr 2> on usbus0
>
> $ grep -i empty /etc/X11/xorg.conf
> Option         "AllowEmptyInput" "off"
>
> $ uname -a
> FreeBSD exxodus.fedaykin.here 8.2-STABLE FreeBSD 8.2-STABLE #12: Sun Jul 10 17:40:20 BRT 2011     lioux@exxodus:/usr/obj/usr/src/sys/LIOUX  amd64
>
> 	Anything I can do to help?
>
> 	This is pretty annoying as the whole screen is frozen from
> time to time... until I move the mouse pointer just the right amount.

It's not a bug, it's a misuse of AllowEmptyInput.  See 
http://www.wonkity.com/~wblock/docs/html/aei.html