[kwlug-disc] USB Webcam curious behaviour

Raul Suarez rarsa at yahoo.com
Sun Aug 15 18:04:34 EDT 2010


Thank you,

That was the same advise as Bob's. I will try with a powered USB hub to see if it makes a difference.

Regards,

Raul Suarez

Technology consultant
Software, Hardware and Practices
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Twitter: rarsamx
http://rarsa.blogspot.com/ 
An eclectic collection of random thoughts


--- On Sun, 8/15/10, Chris Irwin <chris at chrisirwin.ca> wrote:

> From: Chris Irwin <chris at chrisirwin.ca>
> Subject: Re: [kwlug-disc] USB Webcam curious behaviour
> To: "KWLUG discussion" <kwlug-disc at kwlug.org>
> Received: Sunday, August 15, 2010, 2:14 PM
> On Sat, 2010-08-14 at 09:20 -0700,
> Raul Suarez wrote:
> > When I plug just the usb webcam it works, when I have
> the wireless mouse plugged it stops working.
> 
> It could also be a power issue. From my limited
> understanding of USB
> (and a quick check of wikipedia appears to confirm this),
> devices can
> accept power in 1 to 5 units of 100mA, where 500mA is the
> maximum the
> bus supports. So if your camera required higher power (say
> 4 or 5
> units), and your wireless mouse dongle required enough
> power to push
> them over the limit (say 2 units), there would be
> insufficient power to
> run both.
> 
> http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power
> 
> Usually USB ports are in pairs on the same bus. If you had
> four ports,
> two would probably be on a separate bus, which should allow
> you to run
> the devices together. Assuming it is a power issue.
> 
> -- 
> Chris Irwin <chris at chrisirwin.ca>
> 
> -----Inline Attachment Follows-----
> 
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