ok, now i understand.
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As posted in the other thread, this is basically what i am talking about. It shouldnt really do that, thats the Bug i am Talking about.
Whenever the Connection to an HDMI Monitor is made after Booting up, it mostly outputs a Fully Black 1080p60 Signal, no image at all, Camera still working fine otherwise. If you now unplug your HDMI Monitor again, Camera Still works just fine. You plug it back in after that again, the Camera will become unresponsive to User interaction and the Displayed Live image on the internal Screen from the Sensor will go black or freeze (not quite sure anymore) until you Hard-Power-Down the Camera and Restart it. Meaning keeping the Power Button pressed until it shuts down or completely remove Power from the Camera.
After a Restart it will work normally again.
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This is what i describe in the other Thread, could you try to recreate that Freezing of the Camera with HDMI?
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How i got it to Output a Working HDMI Signal reasonably reliable (there are still a couple of times where it would also freeze the Camera Randomly from that, requiring an Reboot once or twice), was to Plug the HDMI Monitor into the Camera, but Still have it Shut down. Then Push the Power Button on the Camera to boot up the Camera. Wait until fully booted, only then Power up your Monitor.
Displayed Image (not the UI, that stays) on the Internal Screen will go black for a short bit, come back again, then again go black for a Short bit, and then Both Monitors Internal and External Should ouput the Image from The Sensor.
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If you havent tried it that way, i would be interested to see if doing it like that will make it work.