linux-kernel - Re: [PATCH] mouse_cypress_ps2: Fix 6.11 regression on xps15z

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Message-ID: <Zs55AWhUEts-uJ5B@google.com>
Date: Tue, 27 Aug 2024 18:10:25 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Woody Suwalski <terraluna977@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mouse_cypress_ps2: Fix 6.11 regression on xps15z

Hi Woody,

On Tue, Aug 27, 2024 at 07:44:12PM -0400, Woody Suwalski wrote:
> Kernel 6.11 rcN on Dell XPS 15Z:  touch pad has stopped working after the
> patch
> 
> commit 8bccf667f62a2351fd0b2a2fe5ba90806702c048
> Author: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Date:   Fri Jun 28 15:47:25 2024 -0700
> 
>     Input: cypress_ps2 - report timeouts when reading command status
> 
> It seems that the first communication is with an invalid packet of 3 NULLs,
> and that
> status failure used to be ignored. With the above patch it is now returning
> an error and
> that results in a dead touch pad.
> 
> The fix is to stop flagging an error for 3-byte null packets, just keep
> ignoring them as before.
> [    2.338016] [    T591] err: Command 0x00 response data (0x): 00 00 00
> [    2.338032] [    T591] ok: Command 0x00 response data (0x): 33 cc a2
> ...
> [    2.770029] [    T591] ok: Command 0x00 response data (0x): 33 cc a2
> [    2.998030] [    T591] ok: Command 0x11 response data (0x): 01 00 64

Could you please send me logs with i8042.debug=1 kernel command line
option please?  I wonder if we need to wake up the controller...

Thanks.

-- 
Dmitry