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2021-04-01T09:21:32.390812Z
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MFC 31070b5bc77a:
Set default alternate setting when USB audio devices are not in use,
to activate power save features.

Differential Revision:  https://reviews.freebsd.org/D28032
Suggested by:	Shichun_Ma@Dell.com
Sponsored by:	Mellanox Technologies // NVIDIA Networking

(cherry picked from commit 31070b5bc77a499009a835650eb9d4bf2eceaa15)

Git Hash:   ba535b10228f0af8021f64890e25f44c446a6cd9
Git Author: hselasky@FreeBSD.org
END