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Message-ID: <d120d500050916082519c660e6@mail.gmail.com>
Date: Fri, 16 Sep 2005 10:25:07 -0500
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reply-To: dtor_core@ameritech.net
To: Andrew Morton <akpm@osdl.org>
Subject: Re: Lost keyboard on Inspiron 8200 at 2.6.13
Cc: linux-kernel@vger.kernel.org, caphrim007@gmail.com
In-Reply-To: <20050916025356.0d5189a6.akpm@osdl.org>
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References: <432A4A1F.3040308@gmail.com>
	 <200509152357.58921.dtor_core@ameritech.net>
	 <20050916025356.0d5189a6.akpm@osdl.org>
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On 9/16/05, Andrew Morton <akpm@osdl.org> wrote:
> Dmitry Torokhov <dtor_core@ameritech.net> wrote:
> >
> > On Thursday 15 September 2005 23:29, Tim Rupp wrote:
> > > I just recently went to upgrade to 2.6.13 from 2.6.12.3 and after
> > > re-compiling with a clean .config, I've hit a snag.
> > >
> > > I'm pretty sure I've got the config script down right, but upon reboot,
> > > I no longer have a keyboard.
> > >
> > > I checked to see if this had crept up between 2.6.12.3 and 2.6.13.1. It
> > > seems that >2.6.13 are the versions that do this.
> > >
> > > Attached are dmesgs from my 2.6.13.1 and 2.6.12.3 kernels. In the
> > > 2.6.13.1 kernel I noticed this line.
> > >
> > >     i8042.c: Can't read CTR while initializing i8042
> > >
> >
> > The kernel failed to talk to your keyboard controller. Try booting with
> > "usb-handoff" and also try "acpi=off"
> >
> 
> This is of course not an acceptable solution.  A machine which worked
> without funky commandline parameters should continue to work in later
> kernels.
> 
> How come it broke?
> 

Interdependencies between ACPI, PNP, USB Legacy emulation and I8042 is
very delicate and quite often changes in ACPI/PNP break that balance.
USB legacy emulation is just evil. We need to have "usb-handoff" thing
enabled by default, it fixes alot of problems.

-- 
Dmitry
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