I’ve been using a Pi 3 B+ with a HiFiBerry Digi+ Pro HAT for several months. While I knew that the HDMI output of the Pi would be disabled after RoPieee started I connected the HDMI output to my AV Receiver anyway so that I could watch the Pi boot and as expected the screen went blank after the Pi booted up. Today I switched to the Pi input to listen to Roon through the receiver and to my surprise I got some text from the Pi displayed instead of a blank screen. This was the first time I saw the text but it could have been visible days ago, I have four Roon endpoints so I don’t use this one every day.
I can’t capture the screen but it is showing five very small lines of text on my 55 inch 4K TV at the top left corner, the first line contains Welcome and the fifth line contains Running.
Just wanted to mention this in case it’s not expected behavior. This is the Information tab from the Pi:
Let me know if you would like me to send feedback from the Pi.