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

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Date:   Sat, 3 Jun 2017 00:03:49 -0400
From:   Paul Donohue <linux-kernel@...lSD.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Masaki Ota <masaki.ota@...alps.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Pali Rohar <pali.rohar@...il.com>,
        Nick Fletcher <nick.m.fletcher@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        scott.s.lowe@...il.com
Subject: Re: [REGRESSION] Touchpad failure after e7348396c6d5 ("Input: ALPS -
 fix V8+ protocol handling (73 03 28)")

This might be related to https://bugzilla.kernel.org/show_bug.cgi?id=195215

Could you have the user try this change? https://bugzilla.kernel.org/show_bug.cgi?id=195215#c12

On Fri, Jun 02, 2017 at 10:54:52AM -0700, Laura Abbott wrote:
> 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
>