linux-kernel - Re: [PATCH] Input: i8042 - add quirk for Lenovo ThinkPad T14 Gen 1

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Message-ID: <ZWF76ALANQwP_9b1@google.com>
Date:   Fri, 24 Nov 2023 20:45:28 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Jonathan Denose <jdenose@...omium.org>
Cc:     linux-input@...r.kernel.org, Jonathan Denose <jdenose@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Mattijs Korpershoek <mkorpershoek@...libre.com>,
        Takashi Iwai <tiwai@...e.de>,
        Werner Sembach <wse@...edocomputers.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: i8042 - add quirk for Lenovo ThinkPad T14 Gen 1

Hi Jonathan,

On Mon, Sep 25, 2023 at 04:33:20PM -0500, Jonathan Denose wrote:
> The ThinkPad T14 Gen 1 touchpad works fine except that clicking
> and dragging by tapping the touchpad or depressing the touchpad
> do not work. Disabling PNP for controller setting discovery enables
> click and drag without negatively impacting other touchpad features.

I would like to understand more on how enabling PnP discovery for i8042
affects the touchpad. Do you see it using different interrupt or IO
ports? What protocol does the touchpad use with/without PnP? If the
protocol is the same, do you see difference in the ranges (pressure,
etc) reported by the device?

Thanks.

-- 
Dmitry