The brightness levels change on my TV screen every few minutes while I'm watching my Apple TV. It happens with "Internet" sources (like Netflix and Vimeo) and "Computer" sources like iPhoto for sure. Maybe the other sources as well. Any clues?
Welcome to the Apple Community.
Check your Tv settings to ensure it's not using some dynamic brightness/contrast setting in response to ambient lighting or the content itself.
Thank you. I'm still working on it.
In my case this seems to be primarily a TV Brightness Settings issue. Set to "Dynamic" rather than standard, natural, or movie, fluctuating brightness levels seem to have vanished.
Brightness levels change while using Apple TV
