I upgraded my TV from 42" 1080p to 55" 4k. It's much easier to control the desktop from the sofa with 125" scaling (when it works) and subtitles are much easier to read. If my monitor was 1080p I would let it mirror in 1080p unless it is playing 4k content. For kids content is has an amazon video button and a xiaomi box. I could set up Plex, but I don't really want to when the computer is in the same room. Can anyone suggest some trickery that can make the image display nicely on a 27" 1440p monitor and 55" 4k tv?
AMD wise, Virtual Super Resolution allows you to effectively output 4k to the lower resolution monitor, so you can mirror at 4k rather than being limited by the lower resolution monitor.
Yep, as I recall you set super resolution for the monitor to match the native resolution of the TV, then just output to the TV at native and mirror. Normally UI will look small on the monitor but at 125% it should be fairly normal looking on both.
Yes, it seems a fairly decent solution but I will probably go back and forth on scaling as the feature is hit and miss in Windows 10.