From owner-freebsd-amd64@FreeBSD.ORG  Sun Feb  5 00:03:58 2012
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Date: Sat, 04 Feb 2012 16:04:01 -0800
From: "Thomas D. Dean" <tomdean@speakeasy.org>
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Subject: Erratic RF USB Keyboard and Mouse Behavior
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I don't think this is amd64 specific, but, ...

 > uname -a
FreeBSD P9X79.tddhome 9.0-STABLE FreeBSD 9.0-STABLE #0: Sat Jan 28 
10:11:39 PST 2012     tomdean@P9X79.tddhome:/usr/src/sys/GENERIC  amd64

 > dmesg
...
ugen3.3: <Chicony> at usbus3
ukbd0: <Chicony HP 2.4Ghz Wireless Keyboard and Mouse, class 0/0, rev 
2.00/1.11, addr 3> on usbus3
kbd2 at ukbd0
ums0: <Chicony HP 2.4Ghz Wireless Keyboard and Mouse, class 0/0, rev 
2.00/1.11, addr 3> on usbus3
ums0: 3 buttons and [XYZ] coordinates ID=4
Root mount waiting for: usbus3 usbus2
ugen3.4: <vendor 0x0cf3> at usbus3
...

The mouse frequently becomes non-responsive, freezing in one spot. 
Moving the mouse for several seconds frees it.  Picking the mouse up and 
sitting it down does it faster.

The keyboard on a more infrequent basis stops responding.  During one 
instance, I pressed a key 8 times before the character was echoed on the 
display.

Suspecting interference, I moved the machine to the opposite side of the 
room with little or no improvement. There are no other RF keyboard/mouse 
systems nearby.

I tried changing USB ports with no change.

Any ideas?

Tom Dean