On Wednesday 01 September 2010 09:57:15 per...@pluto.rain.com wrote:
> Rem P Roberti <remeg...@comcast.net> wrote:
> > Brother!  Muttprint is now working fine.  The problem: the printer
> > was offline!  Now, before you go accusing me of being a complete
> > dufus, let me say that I had no way of knowing that that condition
> > existed.  The printer itself indicated that it was online---no
> > problem.  What happened is that somehow, and I'm not sure what
> > caused this, the printer became disengaged from its usb port.
> 
> I'd call it a bug in the printer that it continues to indicate
> online when it has lost its connection to its host (unless it
> also has a network connection, and in that case I imagine you'd
> be using the network instead of USB).
> 
> > ...  The only way that I could get it talking again to usb was by
> > doing a reboot.
> 
> Now _that_ sounds like a possible bug in the USB subsystem, since
> USB is supposed to be completely hot-pluggable and should not need
> a reboot to get itself straightened out after a mishap.  Cc-ing usb@
> list.
> 
> One question which will surely arise is, which FreeBSD version are
> you using?  The USB stack was completely rewritten in 8.0.

If the USB application does not close the /dev/XXX handles, it will block the 
enumeration of new USB devices on that bus.

Also see "usbconfig -d X.Y reset"

--HPS
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