linux-kernel - Re: [regression] Resume broken on T14s Gen1 (AMD) due to "Input: psmouse - add delay when deactivating for SMBus mode"

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Date:   Tue, 3 Oct 2023 20:08:32 -0500
From:   Jeffery Miller <jefferymiller@...gle.com>
To:     Thorsten Leemhuis <linux@...mhuis.info>
Cc:     Andrew Duggan <aduggan@...aptics.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: [regression] Resume broken on T14s Gen1 (AMD) due to "Input:
 psmouse - add delay when deactivating for SMBus mode"

On Tue, Oct 3, 2023 at 2:30 AM Thorsten Leemhuis <linux@...mhuis.info> wrote:
>
> This didn't print anything on resume, so `psmouse->private` apparently
> is set.
>

Thank you for reporting this and providing the information!

need_deactivate is never being set on the smbdev struct since it's elantouch.
On this machine SMBus is not used so it falls back to PS/2 mode.
When this occurs the psmouse->private pointer is being replaced but
psmouse_smbus_reconnect is still being called on resume expecting smbdev.
That explains why when it is setup needs_deactivate is false, but on resume it
has somehow changed to true.

I've submitted a fix for this at
https://lore.kernel.org/all/20231004005729.3943515-1-jefferymiller@google.com/
and it should resolve this issue for you.

Thanks,
Jeff