I pretty much assume your Pi3 runs a different OS compared to your Pi4.
Try viewtopic.php?p=2266783&hilit=ddcutil#p2266761
Post the output ofwhich 'monitor' do you have? I have some feeling it's not a real 'minitor', more some approach of connecting a display to HDMI via a bridge IC (and not via a scaler chip).
Try viewtopic.php?p=2266783&hilit=ddcutil#p2266761
Post the output of
Code:
ddcutil capabilitiesStatistics: Posted by aBUGSworstnightmare — Thu Dec 19, 2024 8:17 pm