Re: [linux-usb-devel] Problems with connect/disconnect cycles
From: Alan Stern
Date: Mon Mar 21 2005 - 15:18:58 EST
On Mon, 21 Mar 2005, Norbert Preining wrote:
> Dear usb developers, dear Andrew!
> I found that my builtin sd card reader connected via USB port
> experiences several connect/reconnect cycles every time I boot.
> I am using 2.6.11-mm4.
> Here an excerpt from syslog:
> I guess that this should not be the expected behaviour. Now the question
> is wether this is a problem with -mm or with usb stuff?
You mean, a software problem or a hardware problem?
One way to find out is to try going back to an earlier kernel. When you
do, do these cycles continue to appear?
I'm not aware of any software problem that would show up like this.
However, if you find that the cycles go away with an older kernel then you
should build 2.6.11-mm4 with CONFIG_USB_DEBUG turned on. That's the best
way to start looking for clues.
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