keyboard- is it software issue?

[bushw]

Hello,
Recently I have upgraded Armbian on my PBP (w/o kernel). My current kernel is 5.10.60 #21.08.1.

I know, it's old but the newer only makes PBP unusable at all - black screen on boot.

My current issue concerns the PBP keyboard.
Some keys started generating weird outputs. I have never faced with something like that.

When I press 'q' - output is - aq2468
x - zxetuj
c - cfghk
d - DWRI
1 - the screen is dimming

I have no idea if this is software or hardware issue. The computer was on the shelf. Nothing has happened to it physically.

After years of fighting with this crap :( - I want to be sure if that is the last straw to put this computer to the garbage or maybe I can fix it.

If I connect an external keyboard there is no issue.