will answer myself. I've bought the pannel. I've bought the cable. Attached it. I saw the bios logo and setup showing ok so I've bolted all together. Afterwards I've figured out that after any software tries to change screen resolution it just shows blank screen.
- on ubuntu - it shows black screen but its possible to adjust brightness. grub works fine. with nomodeset option you can boot it but you'll loose brightness controls and you can't alter panel resolution. xrandr reports 1920x1080 max resolution for it (I have an external display to check that) and 0mm x 0mm screen physical dimensions - seems display is not fully supported.
-on windows - it will boot fine on clean win10 setup and will show you 4k resolution. You can install nvidia driver and it will still work. But after installing intel one - it will show you black screen.
So its just initialized improperly by UEFI or there's something else to do with it.
There is G9-792 with a screen like that so the bios v1.05 should be compatible. Any ideas appreciated
just in case: don't put it into legacy mode - you'll see no bios setup to revert it. Will have to attach back the old panel to be able to siwtch it to EFI back