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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Sat, 19 Sep 2009 15:53:11 +0200
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Subject: Re: USB-to-serial adapter no longer working in 8.0-RC1
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On Saturday 19 September 2009 05:40:28 Greg Rivers wrote:
> Last May, Hans Petter Selasky fixed up the umct driver for 8.0-CURRENT
> (http://lists.freebsd.org/pipermail/freebsd-current/2009-May/007125.html).
> After updating to 8.0-RC1 I find that the driver has a new problem.
>
> Testing with cu(1) and a modem, I can see by watching the lights on the
> modem and on the usb-serial adapter that it still asserts DTR and sends
> and receives characters properly, but no characters reach the terminal.
> That seems to be the only problem: characters from the attached serial
> device seem to disappear before reaching whatever program has the serial
> device open.  But strangely enough, power cycling the modem results in a
> few "line noise" characters appearing.  Perhaps the driver is no longer
> responding appropriately to DSR?
>
> Any insight or troubleshooting clues would be much appreciated.

Hi,

You need to provide debug output from:

sysctl hw.usb.ucom.debug=15

and

sysctl hw.usb.umct.debug=15

If it exists.

--HPS