linux-kernel - Re: Lenovo Yoga 13 touchpad regression

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Message-ID: <CAJiQ=7DDpCUTXasoo8qbrv-g87Ak7NFvKXSn6+cfhKai06yG_A@mail.gmail.com>
Date:	Mon, 6 May 2013 23:05:08 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-input@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Lenovo Yoga 13 touchpad regression

On Mon, May 6, 2013 at 10:25 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Hello,
>
> The touchpad on Lenovo Yoga 13 seems to have broken some time between 3.4
> and the current kernel.  The dmesg is full of spewage:
>
> [  256.246481] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it
> known.
> [  256.251473] atkbd serio0: Unknown key released (translated set 2, code
> 0xbe on isa0060/serio0
>
> ... about once per second; I am wondering if the touchpad is spewing output
> onto the keyboard channel or if there is something else wrong.

>From googling around this looks like a Synaptics unit.

Is it being detected by the ALPS driver?  If so, did it use the ALPS
driver in 3.4?

alps.c was changed to identify several new models, but PS/2 touchpad
identification uses "magic knock sequences" which may be prone to
false positives.  This is something we should watch for.
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