linux-kernel - Re: cannot reliably detect USB device

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Date:	Thu, 1 Jan 2009 18:44:54 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: cannot reliably detect USB device

Hi,

> > > 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?

Andreas Mohr
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