From owner-freebsd-stable@FreeBSD.ORG Tue Feb 5 17:09:43 2013 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 51EBEA22 for ; Tue, 5 Feb 2013 17:09:43 +0000 (UTC) (envelope-from karl@denninger.net) Received: from FS.denninger.net (wsip-70-169-168-7.pn.at.cox.net [70.169.168.7]) by mx1.freebsd.org (Postfix) with ESMTP id 0242D9A8 for ; Tue, 5 Feb 2013 17:09:42 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by FS.denninger.net (8.14.6/8.13.1) with ESMTP id r15H9gG6036738 for ; Tue, 5 Feb 2013 11:09:43 -0600 (CST) (envelope-from karl@denninger.net) Received: from [127.0.0.1] [192.168.1.40] by Spamblock-sys (LOCAL); Tue Feb 5 11:09:43 2013 Message-ID: <51113CD1.40104@denninger.net> Date: Tue, 05 Feb 2013 11:09:37 -0600 From: Karl Denninger User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 To: freebsd-stable@freebsd.org Subject: Re: So I whip out a FTDI-based multiport Serial USB Adapter.... [SB QUAR: Tue Feb 5 10:15:47 2013] References: <511004AA.3060201@denninger.net> <1360008362.93359.485.camel@revolution.hippie.lan> <511020DB.3050302@denninger.net> <1360012382.93359.489.camel@revolution.hippie.lan> <66CBAB45-621B-47F8-AC67-64F816AFE837@bway.net> <1360015226.93359.502.camel@revolution.hippie.lan> <51107662.8050708@denninger.net> <51107D82.8040605@denninger.net> <51108DB0.7050403@denninger.net> <51113242.4060003@denninger.net> <3af8b2a2d655b0ed501c01e30d00ff0a.authenticated@ultimatedns.net> In-Reply-To: X-Enigmail-Version: 1.5 X-Antivirus: avast! (VPS 130205-0, 02/05/2013), Outbound message X-Antivirus-Status: Clean Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Content-Filtered-By: Mailman/MimeDel 2.1.14 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Feb 2013 17:09:43 -0000 On 2/5/2013 10:44 AM, CeDeROM wrote: > On Tue, Feb 5, 2013 at 5:27 PM, wrote: >> Understood. I was referring to the _computers_ power supply. :) > Still it may be caused by some issued on the USB bus power management. > Normally an USB port can supply 500mA of current. Above that port > should be disabled by the host if I remember correctly. If there is a > hub inside the serial port adapter it would be good to know it it is > powered directly from the USB port or does it have its own power > supply... > > There could be too much power drain from the USB port by external > devices attached to the hub/adapter. But this would be rather obvious. > > There may be some misunderstanding between USB Host and the self > powered USB device, so they cannot agree on the power supply level, > which seems more probable :-) The FTDI adapter has the provision for an external power supply (+5V) but it does not require it unless you're running off an unpowered bus, which is not normally the case. 500ma is quite a bit of available energy. I suspect the issue is found in the KVM, which attaches as a "low" speed device; I'm going to see if I have the same issue with other USB devices connected while the KVM is on the box. -- -- Karl Denninger /The Market Ticker ®/ Cuda Systems LLC