linux-kernel - Re: cannot reliably detect USB device

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Message-ID: <20081225104753.GB15733@localhost>
Date:	Thu, 25 Dec 2008 18:47:53 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: cannot reliably detect USB device

On Tue, Dec 23, 2008 at 06:37:14AM +0200, Greg KH wrote:
> On Mon, Dec 22, 2008 at 04:42:49PM +0800, Wu Fengguang wrote:
> > Hi Greg,
> > 
> > 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.

Thanks,
Fengguang

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