Please attach the output of `sudo ddcprobe` (available in the xresprobe package), so we can see exactly what settings your monitor should be capable of. Also attach your /var/log/Xorg.0.log and /etc/X11/xorg.conf so we can verify the configuration.
Please attach the output of `sudo ddcprobe` (available in the xresprobe package), so we can see exactly what settings your monitor should be capable of. Also attach your /var/log/Xorg.0.log and /etc/X11/xorg.conf so we can verify the configuration.