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From: Luke <lukek@fastmail.fm>
To: Ian Smith <smithi@nimnet.asn.au>
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Subject: Re: Regarding Wake On USB input from S3 Sleep
Date: Sat, 13 Feb 2016 11:17:31 -0800
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> 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 ..
> 
> thanks, Ian

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.