For SDR channel you need to change "HDMI HDR Type" to Dolby. Dolby doesn't actually work as it should (openATV 6.4), but it solves the brightness problem (random quick change) for SDR channels :)
For SDR channel you need to change "HDMI HDR Type" to Dolby. Dolby doesn't actually work as it should (openATV 6.4), but it solves the brightness problem (random quick change) for SDR channels :)