From owner-svn-src-head@freebsd.org Thu May 24 07:41:32 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8E232F5E728; Thu, 24 May 2018 07:41:32 +0000 (UTC) (envelope-from h.schmalzbauer@omnilan.de) Received: from mx0.gentlemail.de (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id DA23D7B891; Thu, 24 May 2018 07:41:31 +0000 (UTC) (envelope-from h.schmalzbauer@omnilan.de) Received: from mh0.gentlemail.de (mh0.gentlemail.de [IPv6:2a00:e10:2800::a135]) by mx0.gentlemail.de (8.14.5/8.14.5) with ESMTP id w4O7fTFH044670; Thu, 24 May 2018 09:41:29 +0200 (CEST) (envelope-from h.schmalzbauer@omnilan.de) Received: from titan.inop.mo1.omnilan.net (s1.omnilan.de [217.91.127.234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mh0.gentlemail.de (Postfix) with ESMTPSA id CA1938EE; Thu, 24 May 2018 09:41:28 +0200 (CEST) Subject: Re: svn commit: r334115 - in head: share/man/man4 sys/dev/usb/template To: Ravi Pokala , Edward Tomasz Napierala , src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org References: <201805232006.w4NK64jS044384@repo.freebsd.org> <9B0033E1-56EC-4CA0-BC28-056871B32B0A@panasas.com> From: "H. Schmalzbauer - OmniLAN" Message-ID: Date: Thu, 24 May 2018 09:41:28 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <9B0033E1-56EC-4CA0-BC28-056871B32B0A@panasas.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]); Thu, 24 May 2018 09:41:29 +0200 (CEST) X-Milter: Spamilter (Reciever: mx0.gentlemail.de; Sender-ip: ; Sender-helo: mh0.gentlemail.de; ) X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 May 2018 07:41:32 -0000 Am 23.05.2018 um 22:35 schrieb Ravi Pokala: > Hi Traz, > > You're referring to power consumption in terms of (milli)Amps. That's not right; power is measured in Watts. What you're actually talking about is *current*. And it looks like in some situations USB devices can draw more than 500mA. Since the voltage isn't a variable when talking about USB power, speaking of "power" while refering to current seems valid to me – it's 5 V only and those who read that don't even need to do any math in head. I never read 2500mW in USB world, 500mA is common. Just my 2¢ -harry