"unfortunately using the 'elan touchpad patch' didn't work because
probably MSFT0001:00 04F3:3140 is not an elan device."

Thats not really correct. The touchpad is from Elan (see Vendor-ID 04F3)
and there are the following two versions:

ELAN0001:00 04F3:3140
MSFT0001:00 04F3:3140

The MSFT (where MS is probably the abbreviation for MicroSoft) seems to
have a different firmware that meets Microsoft's requirements and there
is no driver for it under Linux yet.

Perhaps the following article found on 
"https://windowsarea.de/2016/12/microsoft-praezisionstouchpads- 
Werden-pflicht-unter-windows-10/" will bring some clarity to the matter.
I quickly translated it with Google.

________________

Microsoft: Precision touchpad becomes mandatory for Windows 10 notebooks


During the WinHEC conference in Taiwan, Microsoft announced that the precision 
touchpad will be mandatory in a later Windows update from the Windows hardware 
compatibility program.

This means that manufacturers who do not install such touchpads will not 
receive certification for Windows. Manufacturers can still install Windows, but 
this certificate is simply missing. It's a step in the right direction, 
especially since Windows machines have long been known for their weak input 
devices. A lot has changed in the last few years, especially due to Microsoft's 
commitment. In Windows 10, for example, standard gestures were defined, which 
are mostly supported by the manufacturers.
Precision touchpad ≠ good touchpad

However, the fact that Microsoft will require a precision touchpad in
the future does not mean that it has to be a good touchpad. “Precision
touchpad” is basically just the term Microsoft uses to summarize those
touchpads that communicate via the driver integrated in Windows. In
other words: The touchpad options integrated in the settings can already
be used for the touchpad from Redstone 2. Devices that use a proprietary
Synaptics driver, for example, cannot be controlled with it.

It doesn't matter whether the touchpad comes from Microsoft, Apple, Synaptics 
or a cheap Chinese village. As long as the manufacturer controls its touchpad 
via the Windows driver, it is a “precision touchpad” for Microsoft. The 
Trekstor SurfBook W1 uses the Windows driver and is therefore a “precision 
touchpad”, but the HP Specter x360 is a proprietary panel for the settings. The 
latter undoubtedly has the better quality unit, the only difference is that the 
precision touchpad can be configured in the Windows settings and the HP 
touchpad can only be configured using software specially written for it.
a step in the right direction

The fact that touchpads are to be configured exclusively via the Windows
settings in the future is an important step. Users can find their way
around it better and the use of a touchpad under Windows is also
simplified.

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https://bugs.launchpad.net/bugs/1887190

Title:
  MSFT Touchpad not working on Lenovo Legion-5 15ARH05

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