OK. Just wanted to add my experience. I have a Dell laptop with the following ports: hdmi, usb-c (not display port compatible)! Usb 3.0 and usb 2.0.
I have 2 lg 29 in ultrawide monitors.
Both work with 2560x1080 from hdmi port.
I had a hard time figuring out why I couldn't get 2nd monitor to have correct resolution (kept at 1920x1080 max)
I bought about 5 adapters. At some point I realized usb-c did not support display.
Finally realized I had usb 3.0 - hdmi adapter was plugged into usb 2.0 port.
Voila plugged in usb 3.0 - hdmi adapter into usb 3.0 port. My 2nd monitor has 2560x1080 resolution in display settings. Spent weeks on this problem.
- Check hdmi cable works in hdmi port.
- Check if usb c is compatible as display adapter (it would be specified, if not listed it isn't compatible)
- Check which ports are usb 3.0
I bought insignia usb 3.0 - hdmi 4k adapter Model:NS-PA3UHD
Now that I figured it out it is likely I could have found a cheaper adapter. Biggest thing is to determine what each of your ports are. Buy the right adapter. Dual ultrawide now work. My setup is side by side.
I am going to post this info wherever I can because no answer provided this much detail. I hope I help with any headaches anyone having.
Your support gal