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

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Message-Id: <201103190048.27759.mihai.dontu@gmail.com>
Date:	Sat, 19 Mar 2011 00:48:27 +0200
From:	Mihai Donțu <mihai.dontu@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
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 Thursday 17 March 2011 04:36:54 Alan Stern wrote:
> On Thu, 17 Mar 2011, Mihai Donțu wrote:
> > On Thursday 17 March 2011 00:35:02 Rafał Miłecki wrote:
> > > 2011/3/16 Mihai Donțu <mihai.dontu@...il.com>:
> > > > Added linux-usb and linux-wireless to CC.
> > > > 
> > > > On Thursday 17 March 2011 00:18:31 Mihai Donțu wrote:
> > > >> Hi,
> > > >> 
> > > >> I have just upgraded to 2.6.38 and discovered that I can't use my
> > > >> wireless device (BCM4312 802.11a/b/g). I press Fn + F2, the
> > > >> bluetooth led lights and after a second it turns off by itself. In
> > > >> dmesg I'm seeing the following:
> > > >> 
> > > >> [   88.167212] usb 1-2.2: new full speed USB device using ehci_hcd
> > > >> and address 5
> > > >> [   88.782330] usb 1-2.2: USB disconnect, address 5
> > > >> 
> > > >> I switched to 2.6.37 until I'll have some time to bisect this. In
> > > >> the mean time I have attached the output of lspci, interrupts and
> > > >> dmesg.
> > > 
> > > I suspect it's WMI related. What is your machine?
> > 
> > It's a Dell Latitude D520 but I can't find a link with full specs (in
> > English).
> > 
> > > Please check:
> > > https://bugzilla.kernel.org/show_bug.cgi?id=31002
> > > http://comments.gmane.org/gmane.linux.acpi.devel/49577
> > > 
> > > I can't help you more, I just noticed such a issue reported on ACPI
> > > ML, you have to dig into this yourself (or someone else may help you).
> > 
> > Thanks for the links. I'll see if I can get anywhere from there.
> 
> 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.

-- 
Mihai Donțu

Download attachment "2.6.37-config.gz" of type "application/x-gzip" (17816 bytes)

Download attachment "2.6.37-lsusb.txt.gz" of type "application/x-gzip" (2117 bytes)

Download attachment "2.6.38-1.mon.out.gz" of type "application/x-gzip" (951 bytes)