Re: [PATCH 6.18 303/398] Input: synaptics - disable InterTouch on ThinkPad T440p (board id 2722)

[Daniel Salmun <salmundani@gmail.com>]

On 9/23/26 11:06, Greg Kroah-Hartman wrote:
> 6.18-stable review patch.  If anyone has any objections, please let
> me know.
> 
> ------------------
> 
> From: Raphaël Larocque <rlarocque@disroot.org>
> 
> commit 26eb3d92c7a4d7adb1ae1740ca6e8e100b11d1ec upstream.
> 
> The Lenovo ThinkPad T440p (PNP ID LEN0036, board id 2722) has a
> Synaptics touchpad whose SMBus companion is not ready at boot and
> takes roughly 200 seconds to appear.
[...]
> Disable SMBus InterTouch for board id 2722 so the touchpad and
> TrackPoint work immediately via PS/2 from boot.

I have a concern about this one. Board id 2722 isn't specific to the
T440p. My ThinkPad L440 has the same Synaptics board id, and this patch
would move it from SMBus/RMI4 to PS/2. I have never hit the issue this
commit fixes, and I haven't seen it reported on other potentially
affected models either.

I sent a patch [1] that limits the quirk to the T440p. Previous
attempts to move these touchpads to PS/2 were rejected [2], as
explained in that patch's commit message.

Could this be dropped from the stable queue until it's sorted out
upstream?

[1] https://lore.kernel.org/all/20260925230039.236786-1-
salmundani@gmail.com/
[2] https://lore.kernel.org/linux-
input/65C23A49-5A55-4CF4-9AFD-2DA504DAABF5@duggan.us/