Hi
After updating from 12.0.1 to 12.2.1 CEC is not working too (RPi4 > HDMI0 port).
I have tried without success:
- mount config.txt and write hdmi_force_hotplug=1
- Plugging out and in HDMI cable
- disable CEC and enable again
- reboot few times
I can attach a log file in the evening if desired.