The following reply was made to PR usb/158650; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org
Cc: Renato Tambellini <rtsa...@gmail.com>,
 freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/158650: uplcom USB To COM Device doesn't transmit data, only 
receive
Date: Tue, 5 Jul 2011 09:06:17 +0200

 On Tuesday 05 July 2011 02:37:49 Renato Tambellini wrote:
 > >Number:         158650
 > >Category:       usb
 > >Synopsis:       uplcom USB To COM Device doesn't transmit data, only
 > >receive Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-usb
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Tue Jul 05 00:40:09 UTC 2011
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Renato Tambellini
 > >Release:        8.2-STABLE
 > >Organization:
 > 
 > >Environment:
 > FreeBSD devilbox.homeunix.net 8.2-STABLE FreeBSD 8.2-STABLE #0: Wed Jun  1
 > 05:48:46 BRT 2011    
 > r...@devilbox.homeunix.net:/usr/obj/usr/src/sys/GENERIC  amd64
 > 
 > >Description:
 > The USB To COM Device Prolific PL-2303 doesn't transmit data, only receive.
 > 
 > # dmesg | grep Prolific
 > ugen1.4: <Prolific Technology Inc.> at usbus1
 > uplcom0: <Prolific Technology Inc. USB 2.0 To COM Device, class 0/0,
 > rev 1.10/3.00, addr 4> on usbus1
 > 
 > # usbconfig -d 1.4 dump_device_desc
 > ugen1.4: <USB 2.0 To COM Device Prolific Technology Inc.> at usbus1,
 > cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
 > 
 >  bLength = 0x0012
 >  bDescriptorType = 0x0001
 >  bcdUSB = 0x0110
 >  bDeviceClass = 0x0000
 >  bDeviceSubClass = 0x0000
 >  bDeviceProtocol = 0x0000
 >  bMaxPacketSize0 = 0x0040
 >  idVendor = 0x067b
 >  idProduct = 0x2303
 >  bcdDevice = 0x0300
 >  iManufacturer = 0x0001  <Prolific Technology Inc.>
 >  iProduct = 0x0002  <USB 2.0 To COM Device>
 >  iSerialNumber = 0x0000  <no string>
 >  bNumConfigurations = 0x0001
 > 
 > >How-To-Repeat:
 > 1) Plug the DB9 to serial console on another box using a null-modem cable.
 > 2) Plug the device to USB port.
 > 3) Try to access the console:
 > 
 > cu -l /dev/cuaU0 -s 9600
 > 
 > 4) The terminal only receive data, not transmit.
 > 
 
 Hi,
 
 Can you run usbdump and show what happens when you try to transmit data?
 
 Are you sure the baudrate is correct?
 
 usbdump -i usbus1 -vvvv -s 4096
 
 ugen1.4 -> usbus1
 ugen2.4 -> usbus2
 ...
 
 --HPS
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