MacOS Catalina not supporting full 5120 x 1440 resolution for LG 49WL95C-W monitor

Hello na7777,

Welcome to the Apple Support Communities. I understand the connected display is not showing 5k as an option. I'll do what I can to help.

Make sure to hold the Option key while in System Preferences > Displays > Display and click Scaled as it might be an additional resolution not being displayed. This link will provide more information: Change your Mac display’s resolution

If it doesn't display, these steps here can help: Get help with video issues on external displays connected to your Mac

Take care.

na7777,

If you've tried all the steps and are still unable to connect to the display and you've already talked with the manufacturer, reach out to Apple Support directly: Contact Apple Support

Enjoy your day.

I also confirm this problem! I just upgraded my MacBook Pro 15" to Catalina and I can not use my LG 49WL95C-W with 5120 x 1440 resolution anymore! Before the upgrade it working like a charm!

Please solve this problem ASAP!

I found an external app solution on this URL posted by nutcore.

https://discussions.apple.com/thread/250715148

The app can be downloaded from here:

https://github.com/eun/disablemonitor

Apple, na7777 is saying the option doesn't exist anymore. I too had 5120x1440 before installing Catalina. That option is no longer available. Do you know if a fix is in place or can you find out?

Thanks. That worked great.