linux-kernel - Re: [PATCH 2/2] Input: synaptics - remove X240 from the topbuttonpad list

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Message-ID: <cdcc48a7-bd52-5ea4-6712-7f77604fe549@canonical.com>
Date:   Thu, 23 May 2019 13:02:09 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Christopher Heiny <Cheiny@...aptics.com>,
        Andrew Duggan <aduggan@...aptics.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH 2/2] Input: synaptics - remove X240 from the topbuttonpad
 list



On 5/21/19 2:49 PM, Benjamin Tissoires wrote:
> A quick google image search showed that the X240 had 2 versions: one
> with the top software buttons, one without.
> 
> And this definitively rings a bell. I am sure we asked Lenovo and
> Synaptics to change the PnPID when they would do such a change, but
> they "forgot" during the *40 series refresh.
> We have code in place to fix the reported ranges of the coordinates,
> and we had to check against the board id (see min_max_pnpid_table[] in
> synaptics.c).
> Unfortunately, X240 (LEN0035) is not part of this table, so I don't
> know which refresh of the board ID has implemented the non top
> software buttons.

After double confirm from Lenovo, looks like they mixed up with
touchpads on X240/X240s.

For now only one user reported this LEN0035 doesn't work on SMBus mode.
module parameter can be a workaround.
Maybe some touchpads with software top buttons are working well on
SMBus. Let's keep eyes on this issue for now.

Regards,
Aaron

> 
> Cheers,
> Benjamin