kern/58302: Newer Elantech touchpad is not being registered by pms

[marc@mccd.space]

>Number:         58302
>Category:       kern
>Synopsis:       Newer Elantech touchpad is not being registered by pms
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 31 02:15:00 +0000 2024
>Originator:     Marc
>Release:        10.0
>Organization:
>Environment:
NetBSD bsd 10.0 NetBSD 10.0 (GENERIC) #0: Thu Mar 28 08:33:33 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
On a fresh install of netbsd on a Lenovo T480s, the Elantech touchpad is not being detected by the pms.

I've booted the system with boot -x -v boot parameters. The output of dmesg | grep pms is:

[     1.003983] pms0 at pckbc1 (aux slot)
[     1.003983] pms0: synaptics_probe: Not synaptics.
[     1.003983] pms0: reset 0 0xaa 0x00
[     1.003983] wsmouse0 at pms0 mux 0
>How-To-Repeat:
This problem seems to be happening on newer elantech touchpad models?
>Fix:
Openbsd, Freebsd and Linux all have this working out of the box.

There is an old email thread about this issue on FreeBSD that might be of help?

https://lists.freebsd.org/pipermail/freebsd-drivers/2019-May/002183.html

It leads to a fix that was made in the linux kernel:

https://github.com/torvalds/linux/commit/10d900303f1c3a821eb0bef4e7b7ece16768fba4#diff-e91bc4802c6797fe9acbdca0ed240be9