LG 2560x1080 monitor with MDP > HDMI

Hi I had it that way the same like you and was working flawless now with the upgrade to El capitan it is not working anymore do you have the same problem?

I was using the same exact settings in switch res x and it was working perfectly in Yosemite, but just like you I upgraded to El Capitan and it no longer works 😟 Tried a bunch of new settings, nothing helped. I'm hoping you found a solution since the time when you asked this question 😝

It seems we need to temporarily disable System Integrity Protection for SwitchResX to work in El Capitan

http://www.madrau.com/support/support/srx_1011.html

If you use this package, please write to the developer and urge them to get a developer certificate (be nice about it). Then you will not have to disable System Integrity Protection to use their software.

Thanks so much for this! It really helped me. I'm not sure my monitor all of a sudden didn't work but after using your settings things way more manageable. One question: after using your settings I'm getting a frequency resolution of 53 Hz; however I'm getting a warning that I should switch it to 60 Hz. What settings do I need to adjust to get the recommended 2560 x 1080 60Hz instead of 2560 x 1080 53 Hz? Thank you!

This settings is really working for me! (https://discussions.apple.com/thread/7037954?answerId=28228954022#28228954022)
My screen is LG 25UM58 with MBA (13') mid 2013, in El Capitan with already having the latest update.

I've been trying to find solutions all over the web for this and almost gave up.
But luckily I found this one which really working for me, so thanks so much @whitecrowproductions

Let's how it goes in the long run, hopefully all just good.
Cheers!

This ended my frustration! Thanks so much!

Thank you!!! 🙂