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

On Thu, 17 Mar 2011, Mihai Donțu wrote:

On Thursday 17 March 2011 00:35:02 Rafał Miłecki wrote:

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2011/3/16 Mihai Donțu [off-list ref]:

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Added linux-usb and linux-wireless to CC.

On Thursday 17 March 2011 00:18:31 Mihai Donțu wrote:

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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).

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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.

Alan Stern