linux-kernel - Re: [4.12 regression] Thinkpad X250 Touchpad and Trackpoint not recognized anymore; commit e839ffa: "Input: synaptics

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Date:   Sat, 20 May 2017 07:47:08 +0200
From:   Pascal Wichmann <pascal.wichmann@...w.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [4.12 regression] Thinkpad X250 Touchpad and Trackpoint not
 recognized anymore; commit e839ffa: "Input: synaptics - add support for
 Intertouch devices"

> Looks like you running your patched kernel?
That's right.

>>> CONFIG_RMI4_CORE=m
>>> CONFIG_RMI4_I2C=m
>>> CONFIG_RMI4_SPI=m
>>> # CONFIG_RMI4_SMB is not set
>
> This is your issue I believe.

Indeed, enabling that configuration solves that issue.

However, I think it is quite unintuitive that a module (psmouse) chooses
a default mode which requires another driver which is not necessarily
included; though it would probably be not a very clean solution to
explicitly check that as well.

Is this behaviour, that one module requires another without
communicating that clearly, wanted?

Thanks,
Pascal

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