The following reply was made to PR usb/179505; it has been noted by GNATS.

From: Mike Meyer <m...@mired.org>
To: Hans Petter Selasky <h...@bitfrost.no>
Cc: freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/179505: Kernel detaches Arduino Leonardo (and similar) board
 umodem after the arduino boots
Date: Fri, 28 Jun 2013 12:15:40 -0500

 On Fri, Jun 28, 2013 at 4:09 AM, Hans Petter Selasky <h...@bitfrost.no> wrote:
 > Hi Mike,
 >
 > I was not able to reproduce this issue yet. From the logs you sent I see:
 >
 > That the INTERRUPT endpoint is stalling:
 >
 > DONE-INTR-EP=00000084,SPD=FULL,NFR=1,SLEN=0,IVAL=1,ERR=STALLED
 >
 > Then the USB stack will try to clear the stall. And the clearing of stall
 > also fails:
 >
 > DONE-CTRL-EP=00000000,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=STALLED
 >
 > These messages are mandatory to implement per usb.org specifications. And I
 > know Linux and Windows does not use these very much. In other words I looks
 > like the Arduino could need some more USB certification!
 >
 > After a given amount of stalling, the FreeBSD USB stack will reset the
 > device, which gives you the re-enumeration you are observing.
 >
 > This case can be prevented by setting:
 >
 > sysctl hw.usb.no_cs_fail=1
 >
 > Then try again!
 >
 > --HPS
 
 Hi Hans,
 
 Thanks for looking into this.
 
 Unfortunately, it didn't solve the problem for me. The leonardo still
 creates the umodem devices, then detaches them as the IPL finish.
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