Build-in laptop keyboard doesnt't work on Linux Ubuntu 6.5

A few days ago I bought laptop "Machenike L17A pulsar" that released relatively recently and has no drivers. Installed Ubuntu 22.04.4 with kernel 6.5.0-26-generic (last version). In BIOS integrated keyboard works normally, but after logging in it stops functioning (the bluetooth keyboard, mouse, touchpad are fine).

I've been trying to solve this problem for 3 days, but all resources that I found don't suit me.

1. Tried to downgrade kernel to 5.15.* version (as old as possible for my OS, as I understand it).
2. Installed xserver from various guides in many manuals.
3. Update and reboot system with different settings more than 10 times.
4. Installed any repositories (I knew it probably wouldn't help in any way, but I had no choice).and other...

Sorry if I anything wrong in my question. First time asking and first time using Linux:)

I will be very grateful for any help!

Modified: Fn + some F* keys still work.