The following reply was made to PR usb/156596; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: bug-follo...@freebsd.org,
 daynejor...@gmail.com
Cc:  
Subject: usb/156596: [ehci] Extremely high interrupt rate on ehci/uhci IRQ16 
80% cpu utilization on CPU0
Date: Sun, 24 Apr 2011 10:26:52 +0200

 Hi,
 
 Compile a kernel with:
 
 options USB_DEBUG
 
 Then enable after boot:
 
 sysctl hw.usb.ehci.debug=15 ; sleep 1; sysctl hw.usb.ehci.debug=0
 
 sysctl hw.usb.uhci.debug=15 ; sleep 1; sysctl hw.usb.uhci.debug=0
 
 
 The high interrupt rate might be caused by a non-cleared IRQ.
 
 Else it is an ACPI issue.
 
 --HPS
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