linux-kernel - RE: USB-related instability on 2.6.23-rc1

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Message-ID: <DFEF91B22ED07447AB6AA4B237F913F9B18D8C@ausx3mpc125.aus.amer.dell.com>
Date:	Tue, 31 Jul 2007 16:29:48 -0500
From:	<Stuart_Hayes@...l.com>
To:	<greg@...ah.com>, <grant.likely@...retlab.ca>,
	<linux-usb-devel@...ts.sourceforge.net>
Cc:	<linux-kernel@...r.kernel.org>, <dbrownell@...rs.sourceforge.net>
Subject: RE: USB-related instability on 2.6.23-rc1

Greg KH wrote:
> On Tue, Jul 31, 2007 at 03:06:07PM -0600, Grant Likely wrote:
>> I've observed instability on my Macbook c2d with the Linus' latest
>> tree.  Symptom is that USB devices start behaving badly and the
>> kernel seems to be registering incorrect HID events; (ie. moving the
>> mouse causes odd keyboard events).  If I continue to attempt to use
>> the 
>> mouse, it results in a system freeze (and I don't see any kind of
>> backtrace in /var/log/kern.log).  To reproduce the problem, I just
>> need to be using the keyboard/mouse.  If I leave the system idle, the
>> problem does not seem to occur.  If I actively use the
>> keyboard/mouse, the problem can occur at any time; usually within
>> 5-10 minutes. 
>> 
>> In my particular case, I've got both a USB key/mouse pair on the
>> laptop and an external key/mouse pair plugged in via a hub.
>> Typically, it's the external mouse that exhibits badness first.
>> 
>> USB HID devices are definitely affected.  I have not tested USB block
>> devices.  Isochronous transfers to a USB headset appear to be
>> unaffected, but that's under minimal testing.
>> 
>> I've bisected down to commit
>> 196705c9bbc03540429b0f7cf9ee35c2f928a534, "USB: EHCI cpufreq fix" 
>> 
>> Reverting the patch at the head of the tree makes the kernel stable
>> again. 
>> 
>> I've attached my kernel config file and a dmesg output
> 
> Can you enable CONFIG_USB_DEBUG and send the linux-usb-devel list and
> us, the output when you have these problems? 
> 
> thanks,
> 
> greg k-h

I'm actually in the process right now of attaching a patch for this
problem (well, I hope it's a patch for the problem you're seeing) right
now on the bugzilla (bug 8535 at bugzilla.kernel.org).  If you'd like to
test it, that would be great.

Thanks,
Stuart
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