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Date:      Thu, 6 Apr 2017 12:16:35 +0200
From:      Dominic Fandrey <kami@freebsd.org>
To:        freebsd-stable@freebsd.org
Subject:   Unsupported USB BT device causes high interrupt load
Message-ID:  <20170406121635.99a513360faaf2f40992fb8a@freebsd.org>

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I have an Interrupt load of 2000 interrupts/s from xhci0.

As the culprit I have identified the following device:

ugen0.6: <vendor 0x8087 product 0x07dc> at usbus0, cfg=3D255 md=3DHOST spd=
=3DFULL (12Mbps) pwr=3DON (100mA)

The impression I have from googling this is that it's an unsupported
BT device sitting on board of my Intel Wireless AC 7260 card (I also
have an unsupported SD/MMC card reader sitting on the mainboard).

usbconfig -d 0.6 power_off

Ends the interrupt spree.

I'm running FreeBSD 11.0-STABLE #1 r316490 amd64.

--=20
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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