Based on the information in this thread I am assuming that you use a Pi 4. If that is correct, try adding
dtoverlay=vc4-kms-v3d-pi4
at the top of your “/boot/userconfig.txt”.
Based on the information in this thread I am assuming that you use a Pi 4. If that is correct, try adding
dtoverlay=vc4-kms-v3d-pi4
at the top of your “/boot/userconfig.txt”.