From owner-freebsd-usb@freebsd.org  Mon May 22 12:59:02 2017
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Subject: Re: Ippon Back Power Pro LCD connection flickers
To: lev@FreeBSD.org, freebsd-usb@freebsd.org
References: <1af248e4-50dd-8268-c378-bd5063929310@FreeBSD.org>
 <ca32090d-4b1d-59bc-7ea2-00836f2aa32d@selasky.org>
 <2e73775f-1d81-1e09-22fe-4d46c800b157@FreeBSD.org>
From: Hans Petter Selasky <hps@selasky.org>
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Date: Mon, 22 May 2017 14:57:00 +0200
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Hi,

On 05/22/17 14:23, Lev Serebryakov wrote:
> 15:21:08.960407 usbus1.2
> DONE-INTR-EP=00000081,SPD=LOW,NFR=1,SLEN=0,IVAL=100,ERR=IOERROR

What is the occurrence rate of this IOERROR? Once per attach/detach.

Did you try to connect the USB device to a different port and/or USB HUB.

It might also be that the user-space driver tries to reset the device 
when it sees this error. To figure that out you'll need to enable 
debugging in the UPS software package.

--HPS