Date: Tue, 15 Apr 2014 22:54:36 -0400 From: Patrick Kelsey <kelsey@ieee.org> To: mcgovern@beta.com Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: USB hubs on beaglebone black? Message-ID: <CAD44qMUAh%2BTx6zmTGT3e=fScO8VFOjhRXUVqQEXcmTWL2XN6nA@mail.gmail.com> In-Reply-To: <1397614930.1484.4.camel@fbsd-laptop> References: <1397614930.1484.4.camel@fbsd-laptop>
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On Tue, Apr 15, 2014 at 10:22 PM, Brian J. McGovern <mcgovern@beta.com>wrote: > All, > I'm having an issue with my BBBs and I'm curious if this is a known > issue. Googling on the keywords I can think of hasn't turned up much > useful. When using webcamd, I can get a camera working fine. However, > when I put a powered USB 2.0 hub between the BBB and the camera, I not > only get no picture, but things like the vendor and device ID change... > I'm assuming there is some corruption going on here, but I only have a > small handful of identical USB hubs to play with, so I'm trying to > determine whether going shopping is "worth it", or whether there is a > problem with the USB stack. > > For what it's worth, I've been having in some ways the opposite experience. I was having issues with a wlan adapter plugged directly into the BBB USB port becoming unresponsive over time. This particular adapter requires power near the 500mA limit, so suspecting it might be a power delivery/consumption issue, I interposed a powered USB 2.0 hub and the problem has gone away. In this case, the hub that appears to have resolved my issue is built into a several-years-old NEC monitor. I haven't tested with other hubs. -Patrick
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