If I were you I would file a bug with Apple and offer to send them a device 
that exhibits the issue.  They probably made some changes that had unintended 
consequences.

Woof,

Nano Urbina
Build Slave
Razz Software
http://www.razzsoftware.com     

> On Oct 29, 2014, at 1:42 PM, [email protected] wrote:
> 
> We have a number of "serial USB" devices that work properly on OS X 10.8
> (i.e., arduino, pololu, etc). They are integrated into standalone "kiosk"
> type systems in offices and interface to outboard equipment. This worked
> fine.
> 
> The problem is that now, under 10.10, the USB devices require a replug
> once OS X is booted before they can be seen in /dev/tty.*. This is a
> show-stopper, as forcing the customer to replug them on every boot isn't
> feasible.
> 
> Under 10.8 there was an Apple USB CDC driver .pkg that could be run that
> would cause these devices to be recognized & the proper driver matched and
> loaded during boot so a replug wouldn't be necessary. Is there such a
> package for 10.10?
> 
> -Carl
> 




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