Hi everyone!
The Lenovo Yoga 9-14ITL5 (Type 82BG) comes with two color variants:
1) Shadow Black
2) Mica

Besides color, the main difference is that they have a different touchpad and fingerprint scanner.
However, both use the same motherboard (GYGB0 NM-C841)

I want to create a modification of the shadow black version with a mica c-cover, touchpad, and fingerprint scanner.

The shadow black version of the touchpad is a haptic forcepad produced by Taifang (Honflex-D03). It is connected to the motherboard by two 8-pin cables to the ports marked as TP/FTP1 and FTP2.
The mica version of the touchpad is a classic touchpad (TM-P3390). It is connected to the motherboard only by one 8pin cable connected to the port TP/FTP1.

You could think, that therefore touchpad/fingerprint scanner is interchangeable between the two (and it is actually true for the fingerprint scanner)
However, when I connect Mica Touchpad to the Shadow Black motherboard it is not recognizable.

My guess is that there is some configuration setting hidden in the firmware.

Do you have any ideas where to look for such a setting?


The laptop has Phoenix BIOS.
I have tried setting SMBIOS with a different MTM (the one from the Mica version)

WinFlash32.exe -patch -dps "82BG000DUS"
 

But it doesn't change much. The MTM is seen by the system, but in the UEFI I can still see the original MTM. It looks like this option is only adding the EVSA entry.

I'm looking through entries stored in VSS2/EVSA store but nothing looks relevant.