From owner-freebsd-acpi@freebsd.org  Sun Feb 14 08:49:09 2016
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Date: Sun, 14 Feb 2016 19:48:51 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Luke <lukek@fastmail.fm>
cc: freebsd-acpi@freebsd.org
Subject: Re: Regarding Wake On USB input from S3 Sleep
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On Sat, 13 Feb 2016 11:17:31 -0800, Luke wrote:
 > > I searched the wiki on 'USB power' but noticed only sections 4 and 10 of 
 > > https://wiki.freebsd.org/TuningPowerConsumption seemed to relate at all.  
 > > If that's it or not, I'd appreciate some more guidance ..

 > That's correct, section 10 from that wiki page.
 > Here's all I did:
 > 
 > $ sudo usbconfig
 > (it then lists all USB related devices)
 > $ sudo usbconfig -d 1.3 power_save
 > (then put a device into powersave mode. I put this in a script)
 > 
 > and that was it for me. The zenbook almost imediately reports an extra
 > hour of battery and I can confirm it does indeed extend it's life to
 > close to an hour.

Ah, right.  Mine (6 uhci and 2 ehci root hubs) are all already in 
pwr=SAVE mode, except for the so far unused webcam:

ugen3.2: <product 0x480c Chicony Electronics Co., Ltd.> at usbus3, cfg=0 
md=HOST spd=HIGH (480Mbps) pwr=ON (100mA)

Setting that to power_save saved about 150mW, or 30mA at 5V.  Only a few 
extra minutes (~2%) of battery life, but every little bit helps, thanks.

Not that that's really anything to do with the $subject ..

cheers, Ian