Great, I'm happy that it works for you. Fixes will be included in next beta and I'll send respective fixes to Linux and Crust.
2) No more CEC errors in dmesg and cec-client. I will test ir further later, no access to capable TV at the moment.
Preferred way to check CEC on mainline Linux is to stop Kodi (systemctl stop kodi) and run cec-ctl --playback -S. It should print some TV properties (if it is connected).
3) Suspend/resume and poweroff/poweron worked perfectly while connected to TV. In headless mode though suspend rarely works, mostly fails due to GPU driver error, resulting either instant wakeup, or suspend/crash/smthelse without ability to wake using remote.
Headless poweroff/poweron using remote worked 100% during my tests
Good, that's in line with other devices. I noticed that instant wakeup on few occasions too but currently I'm very happy that it works so well as it does. Poking GPU drivers is the last thing I want to do.