From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dennis Kadioglu <denk@post.com>
Subject: Unlikely big volume range Plantronics BT300
Date: Thu, 7 Apr 2016 08:40:39 +0200 (CEST)
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Hi,

when I connect the bluetooth BT300 of my Plantronics Headset I can see the following warning:

[172855.985539] usb 2-1.3: Warning! Unlikely big volume range (=720), cval->res is probably wrong.
[172855.985544] usb 2-1.3: [5] FU [PCM Playback Volume] ch = 1, val = -10240/1280/16

As far as I understand it, the problem may be solved by applying a quirk which is already applied for Logitech webcams. Can somebody help me in finding out the correct value for cval->res. I have no clue which calculations are necessary for that.

Thanks in advance.
Dennis Kadioglu