I feel like I am missing something pretty basic, and I realize this question may end with a forehead slap on my part. My apologies in advance.
I have a MacBook Pro M1 Chromecasting to my Integra DRX 5.4 Receiver (which has Chromecast built-in). An old Insignia TV is connected to the Integra via the ARC HDMI port. The receiver gets the audio from Roon via chromecast just fine, and the TV displays a “mini player” with very basic song info from Roon.
What I don’t understand is why that same TV that is connected via ARC cannot be set up as a display in Roon? All I really want to do is have album art on the TV while Roon is playing, not the mini player that is currently showing.
ARC is for sending audio that originates from a TV (i.e. apps installed on the TV) to an attached AVR. Not sure what Chromecast has to do with ARC in your post or what you are trying to do exactly but I have a Chromecast (not the one with Google TV) plugged into a small 7" or 8" LCD and I use that as my Roon display in one of my zones. If your TV has Chromecast built-in you may be able to use that instead. Same goes for the Chromecast built-in to your AVR unless they have it limited to audio only.
Thank you, that is helpful and gave me a new way to approach it. I moved the Firestick to a different port on the TV (instead of being plugged into the receiver) and set up a web browser window as a display in Roon. That accomplished what I was looking to do. Thanks again.