From owner-freebsd-current@FreeBSD.ORG  Mon Feb 10 13:01:16 2014
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Date: Mon, 10 Feb 2014 13:01:16 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Hans Petter Selasky <hps@bitfrost.no>
Subject: Re: urtwn driver for Edimax EW-7811U WLAN nano USB Adapter
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Cc: "Julian H. Stacey" <jhs@berklix.com>, Alfred Perlstein <bright@mu.org>,
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On Mon, Feb 10, 2014 at 01:25:06PM +0100, Hans Petter Selasky wrote:
> On 02/10/14 13:21, Alexey Dokuchaev wrote:
> >To augment this a bit: I also came across one of these dongles (vendor
> >0x0bda product 0x8176) that gave me this "timeout waiting for checksum
> >report" message.  Retrying didn't help, but plugging the dongle out and
> >then back in did.  After powercycling the machine, I had to replug it
> >again.  Once replugged, the dongle seems to work fine (I rebuilt kernel
> >and some ports via NFS over it thus far).
> 
> Looking at output from "usbdump -i usbusX -f Y" might give you some clues.
> Else have you tried "usbconfig -d X.Y reset".

Hmm; I've added if_urtwn_load="YES" and some ifconfig...="WPA DHCP" lines
to rc.conf and surprisingly it came up OK after reboot.  usbdump is full
of these lines (timestamps trimmed):

    usbus0.3 SUBM-BULK-EP=00000081,SPD=HIGH,NFR=1,SLEN=0,IVAL=0
    usbus0.3 DONE-BULK-EP=00000081,SPD=HIGH,NFR=1,SLEN=384,IVAL=0,ERR=0
						       ^^^ sometimes 256

If I notice "checksum timeout" situation again, I'll post an update; thank
you for the tips.

./danfe