linux-kernel - Re: serio / atkbd / PS/2 Strangeness with Serial port adapter

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Message-Id: <20090810090508.69E02526EC9@mailhub.coreip.homeip.net>
Date:	Mon, 10 Aug 2009 01:34:43 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Matt Causey <matt.causey@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: serio / atkbd / PS/2 Strangeness with Serial port adapter

Hi Matt,

On Thu, Aug 06, 2009 at 09:15:01PM +0100, Matt Causey wrote:
> 
> So, I enabled debugging on the contoller driver(serio.c), and I see
> that the device generates noise when connected:
> 
> [  458.875614] drivers/input/serio/i8042.c: f2 -> i8042 (kbd-data) [444989]
> [  458.908119] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 0,
> 1, timeout) [445022]
> [  458.908144] drivers/input/serio/i8042.c: ed -> i8042 (kbd-data) [445022]
> [  458.940151] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 0,
> 1, timeout) [445054]
> [  458.940225] drivers/input/serio/i8042.c: d4 -> i8042 (command) [445054]
> [  458.940234] drivers/input/serio/i8042.c: f2 -> i8042 (parameter) [445054]
> [  458.972190] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 1,
> 12, timeout) [445086]
> [  458.972204] drivers/input/serio/i8042.c: d4 -> i8042 (command) [445086]
> [  458.972212] drivers/input/serio/i8042.c: ed -> i8042 (parameter) [445086]
> [  459.004227] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 1,
> 12, timeout) [445118]
> [20171.684870] drivers/input/serio/i8042.c: 0b <- i8042 (interrupt, 0,
> 1) [20162195]
> 
> However - the atkbd driver does not pick the device up at all.
> 

Your device is steadely refusing to say that it is a keyboard - and so
atkbd driver does not bind to it.

> So, I did find a workaround (which is NOT acceptable for this
> deployment).  Remember the PS/2 'wedge' I mentioned?  Well, it has an
> extra PS/2 port for your keyboard.  If I connect a PS/2 keyboard to
> that thing, suddenly my scanner starts working.
> 
> We see some chatter from the controller driver, then one of these:
> 
> [23811.805578] input: AT Translated Set 2 keyboard as
> /devices/platform/i8042/serio0/input/input6
> 

That happened because apparently the 'wedge' passes the inquirys to
the real keyboard and it answers propery.

I think the "i8042.dumbkbd" kernel parameter will solve your issue.

-- 
Dmitry
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