I found this thread:
Thread
CEC stopped working on Pi4 11.0.3 version
All I did was turn it off so I could clear the dust off the fan and on powering up no CEC. Using the search for device on my Samsung tv finds no devices.
I found a little command to test the CEC:
(Code, 33 lines)
A Physical Address of f.f.f.f and Logical Address Mask of 0x0000 seems wrong ?
Plugging my old Pi2 in and it's CEC still works.
I have a backup of 11.0.1 so can I just overwrite and hope that sorts it or do I need to rebuild 11.0.1, apply the backup to it and then update back to 11.0.3 ?
…
I found a little command to test the CEC:
(Code, 33 lines)
A Physical Address of f.f.f.f and Logical Address Mask of 0x0000 seems wrong ?
Plugging my old Pi2 in and it's CEC still works.
I have a backup of 11.0.1 so can I just overwrite and hope that sorts it or do I need to rebuild 11.0.1, apply the backup to it and then update back to 11.0.3 ?
…
PiMONSTER
I disconnected everything, waited 15 minutes, then connected the HDMI to the port next to USB-C power, then powered my TV, then RPi and now CEC is working. I believe that only the HDMI port next to power supports CEC.