Date: Wed, 06 Feb 2013 09:20:26 -0600 From: Karl Denninger <karl@denninger.net> 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] Message-ID: <511274BA.3020604@denninger.net> In-Reply-To: <CAFYkXjni283vXwn0K6xnHfpop1sFTVNcjB2Z=e7uCRTTvmWQsA@mail.gmail.com> 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> <DF3A3AF5-6B74-4D01-9B2E-A1C900540722@bway.net> <51107662.8050708@denninger.net> <51107D82.8040605@denninger.net> <51108DB0.7050403@denninger.net> <bff299b8dda6a83befb45c67ad905944.authenticated@ultimatedns.net> <51113242.4060003@denninger.net> <3af8b2a2d655b0ed501c01e30d00ff0a.authenticated@ultimatedns.net> <CAFYkXj=dSt7hEfGg31ZQdDuqAtM4BKtB-%2Bx5KuZOHGmb_44M=w@mail.gmail.com> <51113CD1.40104@denninger.net> <CAFYkXjni283vXwn0K6xnHfpop1sFTVNcjB2Z=e7uCRTTvmWQsA@mail.gmail.com>
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On 2/5/2013 11:25 AM, CeDeROM wrote: > On Tue, Feb 5, 2013 at 6:09 PM, Karl Denninger <karl@denninger.net> wrote: >> 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. > Karl, can you please use external power supply to power up the adapter > - with and without the additional devices step by step - this way we > will eliminate one of the possible causes :-) > That's pretty-clearly not the problem -- I have removed the KVM from the system and added a couple other USB devices, including switching the UPS attached to it from serial communication to USB, and it's fine. Whatever is going on here it's KVM-related, not the FTDI box. That's an interesting issue all on its own but one that may be rather difficult to solve -- let's toss this thread and I'll start a new one when I can start chasing the KVM issue -- that's one that's not good as well, but I will check across OS revisions and see if it's limited to 9.x or whether it shows up on other, older releases as well first. -- -- Karl Denninger /The Market Ticker ®/ <http://market-ticker.org>; Cuda Systems LLC
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