I get a weird issue while switching to my TV screen. The switcher stays on screen and freezes the DE. I can only move my mouse around. I can put the computer to sleep and the freeze is gone after wake up, but it’s still annoying to have to do it every time I want to watch media on my bigger screen.
I don’t have that problem on my setup. I can switch anytime from tv to computer and back and forth. This is on Xfce with Radeon HD older 7450 card. TV can be off or on same with computer. Just switch inputs and it’s instant.
Edit: it looks like you are trying to extend your display which is different.