From owner-freebsd-acpi@freebsd.org  Sat Feb 13 15:12:37 2016
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Date: Sun, 14 Feb 2016 02:12:28 +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 Fri, 12 Feb 2016 08:49:46 -0800, Luke wrote:
 > I think it was just a few sysctl calls I found on the FreeBSD wiki to
 > poweroff USBs. I can look once I get home if needed.
 > 
 > Luke
 > 
 > -- 
 >   l k
 >   lukek@fastmail.fm
 > 
 > On Fri, Feb 12, 2016, at 08:34 AM, Ian Smith wrote:
 > > On Thu, 11 Feb 2016 07:27:50 -0800, Luke wrote:
 > > 
 > >  > I am VERY new to this but was just doing some hacking on my laptop
 > >  > (zenbook) and found if I poweroff my USBs (while the rest of the machine
 > >  > is still being used) I gain an hour of battery life.
 > > 
 > > What exactly do you do to accomplish that?

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