@xian @sun for whatever reason, HDMI-CEC is fucking ass.

I have a USB adapter but it has poor shielding/insulation so 4K60 signal gets interrupted every once in a while, and it works by emulating a modem/serial device so only specific things (like Kodi) can really take advantage of it, and even then there's a pretty big lag and every once in a while Kodi/adapter just spazzes out and refuses to work for a while. Only other option nowadays (that I'm gonna try out someday) is by using some specific HDMI-DP adapters (i.e. not all) that somehow lets normal GPUs to use HDMI-CEC over DP but only with some drivers/brands... And you would most likely still get lag.

https://wiki.archlinux.org/title/HDMI-CEC

Bottom line, using CEC just to use your original tv remote is fucking ass, only thing CEC is good for is to wake up the tv and switch input when device comes online.