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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org,
 gabor@sentex.net
Date: Thu, 4 Dec 2008 23:20:47 +0100
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Cc: 
Subject: Re: ucom serial bug?
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On Thursday 04 December 2008, Gabor wrote:
> Some more twists to this.  As I said if I kill off our program and restart
> it, it never sees carrier unless the module was reloaded. However, if I
> unplug the serial cable from the Windows box and re-plug it, carrier goes
> and comes back as expected but only as long as our software is running.  If
> our software is not running and we unplug the serial cable from the Windows
> box, carrier does not come back when we start up our program with the cable
> plugged back in.

Maybe you can try setting the MSR to zero when the modem is opened in the 
uftdi.c driver file.

In USB2 there is also a sysctl for UFTDI debugging which you can check.

--HPS