it worked for me the first time I booted the pi 4, but after turning the samsung off and back on a little later, not working anymore.
I think samsung cec and/or the cec library are just not that sturdy. I had tried messing with some libcec stuff a while ago and gave up.
It might just some intermittent thing that eventually works if you unplug the cable or reboot enough times, sorry people that bought new cables.
Try different combinations of power cycling (really unplugging) your tv and the pi.
has anyone tried
`hdmi_force_hotplug=1` in config.txt?
I've been having better luck now with
But I need to test having the TV off for a few hours then turning it on again