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

From: Hans Petter Selasky <>
To: Colin Percival <>
Cc: "" <>
Subject: Re: usb/156596: [ehci] Extremely high interrupt rate on ehci/uhci 
IRQ16 80% cpu utilization on CPU0
Date: Sat, 9 Jul 2011 11:07:16 +0200

 On Friday 08 July 2011 22:37:45 Colin Percival wrote:
 > Hi,
 > I'm seeing this ehci interrupt storm with 8.2-RELEASE on my Dell E5420
 > laptop; vmstat -i reports 187300 interrupts per second from ehci.
 > I've attached my /var/log/messages showing the boot messages and 1 seconds
 > worth of hw.usb.ehci.debug=15 output as suggested.  Hopefully it means
 > more to you than it does to me...
 Have you tried to set any of these quirks:
 hw.usb.ehci.lostintrbug: 0
 hw.usb.ehci.iaadbug: 0
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