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Date: Sun, 13 Oct 2013 16:45:30 +0700
From: Alexey Dokuchaev <danfe@nsu.ru>
To: Hans Petter Selasky <hps@bitfrost.no>
Subject: Re: iPhone 4(S) access via gphoto2
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On Sun, Oct 13, 2013 at 10:37:58AM +0200, Hans Petter Selasky wrote:
> You might want to watch "usbdump -i usbusX -f Y -vvv -s 65536"
> 
> while running the config descriptor dump for the broken device. Look for
> non-zero ERR=

Not much, only occasional timeouts (probably after I repeated usbconfig(8)
too fast):

# usbdump -i usbus4 -f 2 -vvv -s 65536 | grep ERR= | grep -v ERR=0
17:04:17.306156 usbus4.2 DONE-CTRL-EP=00000080,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=TIMEOUT

> Might also be a corrupt USB descriptor, which the USB stack will reject.
> 
> Would be interesting to know what the cause of this issue is. Are any of
> these iPhones JailBroken?

No, none of them are/were jailbroken.  All dumps are available if you are
interested.

./danfe