I have designed a system that has freerun mode enabled and have discovered a small bug. When using an older 1080p Samsung monitor, I am able to have freerun mode (blue screen at 480i) run perfectly each time. But when connected to my 4k Vizio TV, I cannot get freerun to work. The display just states there is no signal.
1080p Samsung TV
Free run works
4K Vizio TV
Free run does not work
I though freerun is just a signal generated within my analog chip and put out as a video source onto my HDMI TX? Is this not the case? or what do certain displays do differently?