linux-kernel - [REGRESSION] Touchpad failure after e7348396c6d5 ("Input: ALPS

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Date:   Fri, 2 Jun 2017 10:54:52 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Masaki Ota <masaki.ota@...alps.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Pali Rohar <pali.rohar@...il.com>
Cc:     Paul Donohue <linux-kernel@...lSD.com>,
        Nick Fletcher <nick.m.fletcher@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        scott.s.lowe@...il.com
Subject: [REGRESSION] Touchpad failure after e7348396c6d5 ("Input: ALPS - fix
 V8+ protocol handling (73 03 28)")

Hi,

Fedora got a bug report https://bugzilla.redhat.com/show_bug.cgi?id=1447327
of a touchpad failure on a Dell Latitude E7370. Testing showed that the
bad commit was

commit e7348396c6d51b57c95c6646c390cd078e038e19
Author: Masaki Ota <masaki.ota@...alps.com>
Date:   Fri Mar 17 14:10:57 2017 -0700

    Input: ALPS - fix V8+ protocol handling (73 03 28)
    
    Devices identified as E7="73 03 28" use slightly modified version of V8
    protocol, with lower count per electrode, different offsets, and different
    feature bits in OTP data.
    
    Fixes: aeaa881f9b17 ("Input: ALPS - set DualPoint flag for 74 03 28 devices")
    Signed-off-by: Masaki Ota <masaki.ota@...alps.com>
    Acked-by: Pali Rohar <pali.rohar@...il.com>
    Tested-by: Paul Donohue <linux-kernel@...lSD.com>
    Tested-by: Nick Fletcher <nick.m.fletcher@...il.com>
    Cc: stable@...r.kernel.org
    Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

I suspect this particular model needs special handling as well?

Thanks,
Laura