linux-kernel - Re: [b43] usb device disconnects automatically after 1s

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Date:	Fri, 18 Mar 2011 21:38:13 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mihai Donțu <mihai.dontu@...il.com>
cc:	Rafał Miłecki <zajec5@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-wireless@...r.kernel.org>
Subject: Re: [b43] usb device disconnects automatically after 1s

On Sat, 19 Mar 2011, Mihai Donțu wrote:

> > Another thing you can try is to get usbmon traces under both 2.6.37 and
> > 2.6.38.  Instructions are in the kernel source file
> > Documentation/usb/usbmon.txt.
> 
> I'm unable to get a usbmon dump on 2.6.37. Strangely, the only USB device 
> making noise (on 0u) is my mouse's wireless receiver. I had no such problem on 
> 2.6.38 though.

I noticed your config has CONFIG_USB_EHCI_TT_NEWSCHED disabled.  You 
really should enable it (although I doubt that it is responsible for 
this problem, since 2.6.37 works without it).

The 2.6.38 usbmon trace shows pretty much what you might expect: The 
device connects and is initialized and enumerated normally, then 2 
seconds later it disconnects.  We really need to see a 2.6.37 usbmon 
trace to compare for differences.

Can you try again?  If usbmon isn't working, there's something _very_ 
strange going on.

Alan Stern

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