linux-kernel - Re: Lenovo 3000 N100 i8042 problems

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Message-ID: <alpine.LNX.1.00.0809042323150.19665@iabervon.org>
Date:	Thu, 4 Sep 2008 23:27:14 -0400 (EDT)
From:	Daniel Barkalow <barkalow@...ervon.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	Christopher Desjardins <cddesjardins@...il.com>
Subject: Re: Lenovo 3000 N100 i8042 problems

On Thu, 4 Sep 2008, Dmitry Torokhov wrote:

> On Thursday 04 September 2008, Daniel Barkalow wrote:
> > On Wed, 3 Sep 2008, Daniel Barkalow wrote:
> > 
> > > On Wed, 3 Sep 2008, Dmitry Torokhov wrote:
> > > 
> > > > On Tue, Sep 02, 2008 at 12:16:15PM -0400, Daniel Barkalow wrote:
> > > > > legacy mode only has a bug that doesn't matter to Windows, and active mux 
> > > > > may have some of the usual problems but nothing I particularly noticed.
> > > > > 
> > > > > I noticed that, when my i8042 would stop working, it would generally have 
> > > > > just delivered one mouse interrupt to CPU1 after never previously doing 
> > > > > so. Perhaps there's some sort of deadlock in the Linux i8042 driver when 
> > > > > both cores are unexpectedly getting interrupts from the two devices at 
> > > > > once? I could understand there being a Linux bug only triggered by quirky 
> > > > > hardware that only applies to legacy mode, which was just uncovered by 
> > > > > this patch.
> > > > >
> > > > 
> > > > I am not sure, internally we the kernel still deals with 2 interrupt
> > > > sources (KBD and AUX) regardless whether it is in legacy or active
> > > > multiplexing mode...
> > > > 
> > > > Does it take long to trigger the bug? You coudl try doing "echo 1 >
> > > > /sys/modules/i8042/parameters/debug" and thend me dmesg or
> > > > /var/log/messages after the bug was triggered - I might see something
> > > > there. But please be aware that if you send me such a log I can decode
> > > > everything that you have been typing...
> > > 
> > > It's usually within an hour of the right usage pattern. I'll try to 
> > > trigger it with debugging on while not typing anything secret Thursday 
> > > evening.
> > 
> > Attached. 
> 
> That is untruth :))

Can I blame my keyboard? No, probably not, I sent that with the keyboard 
working. In any case, now it's attached for real.

	-Daniel
*This .sig left intentionally blank*
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