Hello all,
I would like to write a report on my results, to return my knowledge back to this community.
Again, I have a SP3, i5, with an n-trig digitalizer.
The following is the original LCD + digitalizer model version, respectively.
LTL120QL01-001 v1.0
I replaced it with
LTL120QL01-001 v1.1
Yes, same display LCD model, but upgraded digitalizer version (both are n-trig, not Wacom)
The newly upgraded LCD + digitalizer model works natively in the BIOS, but it would not work at all in Windows 8.1 (everything updated, including latest firmware)
i. Works in BIOS
ii. Does not respond to touches at all in Windows 8.1
iii. BUT it responds to both SP3 Pen, and SP4 Pen (without being paired via Bluetooth)
Then, I upgraded the system to Windows 10 (version 15**), and it works right away at the initial bootup/setup screen.
In conclusion, I do not know why my new LCD does not work at all in Windows 8.1