Date: Fri, 9 Apr 2010 05:25:24 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: perryh@pluto.rain.com Cc: freebsd-questions@freebsd.org Subject: Re: USB Powered Speakers Message-ID: <alpine.BSF.2.00.1004090518480.42950@wonkity.com> In-Reply-To: <4bbedc81.G0j71lonOCUqR/vZ%perryh@pluto.rain.com> References: <4BBE8DB1.8040905@joseph-a-nagy-jr.us> <i2t75107331004081934n2745bc80s827568d06743a9a@mail.gmail.com> <4BBE9470.1040607@joseph-a-nagy-jr.us> <u2r283c23cd1004082121ye23254a4v3286d9636ee88526@mail.gmail.com> <l2q283c23cd1004082123v2d9ca5f1h8561ff3ad41cd5fb@mail.gmail.com> <4BBEB5BC.3000509@joseph-a-nagy-jr.us> <4bbedc81.G0j71lonOCUqR/vZ%perryh@pluto.rain.com>
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On Fri, 9 Apr 2010, perryh@pluto.rain.com wrote: > Programmer In Training <pit@joseph-a-nagy-jr.us> wrote: > >> ... they are only attached for power purposes ... > >> Input power: DC 5V 500mA > > Any chance these speakers need a USB 2.0 port, and all the ports > on your FreeBSD box are 1.x? I don't remember the USB power spec > offhand, but 2.5W may exceed what a USB 1.x port can supply -- > a limit that applies regardless of the system's overall power > provisioning. 500 mA is 5 unit loads for USB 2.0, or powered hub territory. The device has to request that high power mode, and the system can say no and disable the port. That should show in /var/log/messages. -Warren Block * Rapid City, South Dakota USA
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