linux-kernel - Re: uvcvideo causes ehci

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Date:	Tue, 13 Oct 2009 10:53:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
cc:	linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: uvcvideo causes ehci_hcd to halt

On Tue, 13 Oct 2009, [UTF-8] Ozan ÃaÄlayan wrote:

> Hi,
> 
> Some recent netbooks (Some MSI winds and LG X110's) equipped with an
> integrated webcam have non-working USB ports unless the uvcvideo module
> is blacklisted. I've found some bug reports in launchpad:
> 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/435352
> 
> I have an LG X110 on which I can reproduce the problem with 2.6.30.8.
> Here's the interesting part in dmesg:
> 
> Oct 13 08:46:32 x110 kernel: [  261.048312] uvcvideo: Found UVC 1.00
> device BisonCam, NB Pro (5986:0203)
> Oct 13 08:46:32 x110 kernel: [  261.053592] input: BisonCam, NB Pro as
> /devices/pci0000:00/0000:00:1d.7/usb1/1-5/1-5:1.0/input/input10
> Oct 13 08:46:32 x110 kernel: [  261.053891] usbcore: registered new
> interface driver uvcvideo
> Oct 13 08:46:32 x110 kernel: [  261.054755] USB Video Class driver (v0.1.0)
> Oct 13 08:46:32 x110 kernel: [  261.091014] ehci_hcd 0000:00:1d.7: force
> halt; handhake f807c024 00004000 00000000 -> -110

Can you add a dump_stack() call just after the ehci_err() line in 
drivers/usb/host/ehci-hcd.c:handshake_on_error_set_halt()?  It should 
provide some clues.

At the same time (i.e., during the same test) you should collect a 
usbmon trace.

Alan Stern

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