linux-kernel - Re: [regression] usb: sometimes dead keyboard after boot (with debug log)

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Message-Id: <200808301736.27377.elendil@planet.nl>
Date:	Sat, 30 Aug 2008 17:36:26 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: [regression] usb: sometimes dead keyboard after boot (with debug log)

On Tuesday 26 August 2008, Alan Stern wrote:
> > Attached a full diff between dmesg from two consecutive boots: first
> > without keyboard; after reboot the keyboard is detected. The actual
> > difference is fairly small and clearly shows that usb 3-1 is not
> > handed off correctly, probably due to a small difference in timing.
> >
> > Note that I've never seen this problem with earlier kernels.
>
> I can't tell exactly what's going on because your usbcore module wasn't
> built with CONFIG_USB_DEBUG enabled.

I got lucky on the second boot with -rc5 and USB_DEBUG enabled.
Attached the output of dmesg. After this boot the keyboard was dead and 
the telltale "reset low speed USB device" message is present.

Cheers,
FJP


View attachment "dmesg_no-keyboard_debug" of type "text/plain" (42814 bytes)