Something kills my keyboard when SDDM shows up

Hi Folks,

I have a small funny problem that I have to disconnect and re-connect my keyboard after boot before I can type password to login into KDE Plasma.

The problem is definitely Xorg / SDDM / Plasma since my first NixOS generation was without X and I didn’t have that problem. But then when I configured plain simple Plasma: KDE - NixOS Wiki
it started happening. I can change generation in Grub so keyboard is just fine and something kills it before or immediately after I see graphics.

Is there anything I could try to disable / change?

Thank you.

I’ve switched over to awesomeWM because (xorg/wayland)+sddm+plasma in unstable has been broken for me since around July 11th.