Date: Tue, 15 Apr 2014 23:11:02 -0400 From: "Brian J. McGovern" <mcgovern@beta.com> To: Patrick Kelsey <kelsey@ieee.org> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: USB hubs on beaglebone black? Message-ID: <1397617862.1484.21.camel@fbsd-laptop> In-Reply-To: <CAD44qMUAh%2BTx6zmTGT3e=fScO8VFOjhRXUVqQEXcmTWL2XN6nA@mail.gmail.com> References: <1397614930.1484.4.camel@fbsd-laptop> <CAD44qMUAh%2BTx6zmTGT3e=fScO8VFOjhRXUVqQEXcmTWL2XN6nA@mail.gmail.com>
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On Tue, 2014-04-15 at 22:54 -0400, Patrick Kelsey wrote: > > > > 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 > Its an interesting data point. I'm pretty sure I don't have a power problem, as the hub is powered, and the camera works great without the hub (I _am_ using a 5V PoE injector to power the BBB, so I'm not running off the 500ma available via the USB connection), but not with. I'll try to collect some data around what I'm seeing with and without the hubs tomorrow. I'll also have to check to see what the cameras do on more traditional AMD64 hosts and VMs, in case its the cameras instead of the hub causing the problems (they're logitech units, both SVGA and 1080p, but I don't have the models at my fingertips. My goal with this exchange was to see if I got a "don't bother, it doesn't work right" type message, but it looks like it may be going the other way :)
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