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Date:      Fri, 21 Feb 2020 10:13:17 +0100
From:      Hans Petter Selasky <hps@selasky.org>
To:        Kris G <netsick@gmail.com>
Cc:        freebsd-usb@freebsd.org, Kevin Lo <kevlo@freebsd.org>
Subject:   Re: RTL8192EU USB Wifi error: rtwn0: r92e_power_off: failed to block Tx queues
Message-ID:  <2a29469e-005b-d4e3-ce8a-0783a0ca58d6@selasky.org>
In-Reply-To: <CAFJznXDitk_RdhWma1uzDZkdHnRem=AmtVnH9A-wTqvc=cSEHA@mail.gmail.com>
References:  <CAFJznXDW=N60iAGH43o2MF%2BPqGuXC2OMfi6KeyX60Tm5CQyT7w@mail.gmail.com> <CAFJznXDaB5SgkJgOWemtXc3QSHYPTdFwo6d0AhJsCye8RAT_hw@mail.gmail.com> <7797a517-7881-ed8c-5f29-ad0f4241e631@selasky.org> <CAFJznXDitk_RdhWma1uzDZkdHnRem=AmtVnH9A-wTqvc=cSEHA@mail.gmail.com>

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On 2020-02-21 06:47, Kris G wrote:
> rtwn0: detached

Hi,

Likely the device's firmware crashes/restarts and the device detaches.

Maybe you can do a usbdump of all traffic, to isolate exactly which 
command causes this.

usbdump -i usbusX -f Y -s 65536 -vvv

X and Y are numbers after ugen.

Run this before starting wpa supplicant.

--HPS4



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