Date: Fri, 11 Apr 2014 13:07:29 +0800 From: Erich Dollansky <erichsfreebsdlist@alogt.com> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-usb@freebsd.org Subject: Re: USB 3 devices not reliably connecting at 5Gbps Message-ID: <20140411130729.489d3513@X220.alogt.com> In-Reply-To: <A9616810-7BD9-49FC-BFA7-44206E4CCAC1@gsoft.com.au> References: <A9616810-7BD9-49FC-BFA7-44206E4CCAC1@gsoft.com.au>
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Hi, On Fri, 11 Apr 2014 14:03:19 +0930 "Daniel O'Connor" <doconnor@gsoft.com.au> wrote: > I have a FreeBSD 9.2 system on which I am developing a USB3 data > acquisition card (based on the Cypress FX3) and I have found that it > doesn't reliably connect at 5GBps - quite often it seems to only > connect at 480MBps. > > If I connect it to my macbook pro (running OSX) it reliably connects > at 5Gbps. allow me to share my own experience with USB3. My X220 has a single USB3 port. I have two USB cases in which are 500GB built-in. The cases are identical except of the serial number. But the cases came with two different cables. FreeBSD only connects randomly at full speed when I use the cable which came first on both cases. But it connects always with full speed using the new cable. It is either the error handling of FreeBSD or the quality of the electrical signal. Keep this as a hint in mind when debugging your problem. Erich
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