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    SubjectRe: cannot reliably detect USB device
    On Thu, Jan 1, 2009 at 18:44, Andreas Mohr <andi@lisas.de> wrote:
    >> > > I have a pl2303 USB-RS232 converter that cannot be reliably
    >> > > detected.
    >> >
    >> > Faulty hardware? Flaky cables? Bad connections? If this is
    >> > reproducable for the same device on multiple machines, I'd just go buy
    >> > a
    >> > new device :)
    >>
    >> I decided to give it a last try before planning a replacement - then I
    >> find that /dev/ttyUSB0 could be created if I enlarge the retry times.
    >>
    >> It could take 10 seconds to get a valid response. It must go crazy.
    >
    > Detected _instantly_ on 2.6.28 here:
    >
    > [59750.560209] usb 1-1: USB disconnect, address 5
    > [59750.561888] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
    > [59750.561970] pl2303 1-1:1.0: device disconnected
    > [59752.904108] usb 1-1: new full speed USB device using uhci_hcd and address 6
    > [59753.059546] usb 1-1: configuration #1 chosen from 1 choice
    > [59753.061460] pl2303 1-1:1.0: pl2303 converter detected
    > [59753.114738] usb 1-1: pl2303 converter now attached to ttyUSB0
    >
    > (the 3-second delay basically was me waiting before reinserting)
    >
    >
    > Bus 001 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
    >
    > Label: "GMUS-03 USB Serial Adapter"
    >
    > Detection test only, _not_ used for actual serial communication currently...
    >
    >
    > But there are more PL2303 adapters than flies on this planet,
    > thus someone else also has some input on this?

    Mine works fine with today's Linux git tree:
    usb 1-2.2: new full speed USB device using uhci_hcd and address 11
    usb 1-2.2: configuration #1 chosen from 1 choice
    pl2303 1-2.2:1.0: pl2303 converter detected
    usb 1-2.2: pl2303 converter now attached to ttyUSB0

    Kay


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