USB -> Serial port Adapter Troubles (abridged)

From: David Kirk (nospam_at_nospam.net)
Date: 01/31/05

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    Date: Sun, 30 Jan 2005 18:08:05 -0500

    Hello, after doing quite a bit of googling with no luck I was wondering if
    anyone could help me out.

    I am trying to get the USB -> serial adaptor on a Targus Mobile Port
    Station to work so that I can attach an external serial modem to my
    laptop. Other USB devices attached to the system through the Port Station
    (which also has a 5 port USB hub) work without any problems so the
    hardware does not seem to be at fault. In fact the USB -> serial port is
    detected by the system during boot-up, and the correct driver is loaded
    and attached to /dev/ttyUSB0 as indicated by the following lines from the
    dmesg command:

         drivers/usb/serial/usb-serial.c: USB Serial Driver core v2.0
         drivers/usb/serial/usb-serial.c: USB Serial support registered for
    PL-2303
         usb 1-3.1.4.2: PL-2303 converter now attached to ttyUSB0
         drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor
    driver v0.11

    Everything seems OK until any attempt is made to access the port by any
    program (e.g. setserial), the program fails indicating a protocol error,
    and the file /dev/ttyUSB0 is deleted. Also, the following lines can now be
    found using the dmesg command:

         PL-2303 ttyUSB0: pl2303_open - failed submitting interrupt
    urb,error -28
         PL-2303 ttyUSB0: PL-2303 converter now disconnected from ttyUSB0

    Configuration Info:

           System: Dell Inspiron 5150, 1GB ram, 3.03GHz P4 mobile
    Linux Distro: Red Hat - Fedora 3
            Kernel: 2.6.9-1.667

    My thanks to all who take the time to read this message!

    - David Kirk

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