My dual monitor setup suddenly stopped working this morning when I turned on my computer, was working fine last night. It seems that both monitors will work (one at a time) when I put their HDMI cable into the 2k input, it’s the 4k input that is causing the issue. In effect, only one monitor will work at a time.
Also, although my setup and computer has appeared to be working fine, I have been getting an error the last few weeks that “this thunderbolt application is not in use anymore and can be safely uninstalled”.
I am using a Lenovo Thinkpad T480, Dell Monitor U2415 and Dell P2414H.
Any help be much appreciated, thanks