linux-kernel - Re: [PATCH] usb-core: Add MS_INTR

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Date:   Sun, 12 Mar 2017 17:42:47 -0400
From:   Dave Mielke <dave@...lke.cc>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Samuel Thibault <samuel.thibault@...-lyon.org>,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, kevin.derome@...tech.eu,
        clause.andreabush@...il.com, mengualjeanphi@...e.fr
Subject: Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk

[quoted lines by Alan Stern on 2017/03/12 at 17:18 -0400]

>Interesting.  This is a high-speed device that mistakenly uses the 
>low/full-speed encoding for an interrupt bInterval value?

Yes.

>That's pretty unusual.  Most HID devices (which includes the Braille
>devices I have heard of) run at low speed, and a few of them run at 
>full speed.  I can't remember any running at high speed.

According to my collection of data, 5 say 1.00, 15 say 1.1, and 21 say 2.0.

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