How to display 2560x1080 on external monitor from MBP or MBA?

Never even thought of going to TonyMAC. Just picked up 2 new LG Ultrawide monitors and was afraid they were going back....your post saved the day. Can these settings be tweaked to improve font clarity?

Hey guys, Im in desperate need of help!!

So I have just got a LG 25" UltraWide Monitor 25UM57 & I cant get it to work on full 2560x1080 resolution. I have tried stuff that you guys have said previously & nothing has worked. Have played around with the settings on SwitchResX & it wont work. I managed to add the 2560x1080 setting that a previous poster gave but when I click it one added in custom settings my monitor goes black then says "Out of Range"???

Out of Range means there's incompatibility between the signal coming from the graphics card to the monitor.

Did you enter the values for the custom SwitchResX exactly as they're listed in this image?: https://i.imgur.com/Daydyeu.jpg

What kind of cable are you using to connect the macbook to the monitor?

Yes I did, doesnt work.

Im using a Mini Display port to HDMI cable. I have a 2012 Macbook Pro.

LOL omg wow!! I put the settings in again, restarted my macbook & its now working perfectly!!

I cant believe it. I think I had something wrong before, so thankyou very much for your help

Just spoke to Apple and - sadly - the problem for me is that the Macbook Air doesn't support the resolution of the monitor 😟

Supported resolutions by MacBook Air early 2015:

1440 by 900 (native), 1280 by 800, 1152 by 720, and 1024 by 640 pixels at 16:10 aspect ratio and 1024 by 768 and 800 by 600 pixels at 4:3 aspect ratio

Hey guys,

I have a LG 25UM65 and MacBook Air 2013.

I hope thats not a silly question. If i'm using SwitchResX and put my resolution on 2560x1440 how bad can do on my mac? :/

Hi Emery,

I'm also trying to set up my LG 25UM57 with my MacBook Air 2015 by using SwitchResX and I tried to use the configurations you sent across, however, after editing a few things in the settings the SwitchResX stops allowing me to edit the number (I guess it has presets), so I cannot use the same settings you shared with us.

I guess your monitor is different to mine, isn't it?

Thanks for all the suggestions in the thread. I just bought an LG 29UM57 to use as a second monitor for my MBP (2012) and I was starting to be convinced there was no fix. The jpeg linked from Emeryshores post seems to be working well for me now although I'm currently still running Yosemite and not El Capitan so we'll see what happens when I eventually get around to updating to it. Thanks again.

I Found a solution to my problem, maybe it's the same one for yours:

https://youtu.be/k2MdxzAC4cA

Lol. This particular answer helped me solve the same problem. Unbelievable.

Did you find a solution to your problem? I have the exact same problem.

Check 2Good4U answer. That helped me.

It doesn't work me. My problem is that my monitor worked fine for 2 months, then one morning it decided to revert to 1080p and not 1440. How was it possible it worked fine, and then one morning just stop working? Is the problem with my monitor or laptop?

It displays at 1080p, but if I try and change it to 2560 x 1440 (see image), the image is shrunk. Other resolutions work fine.

Thank you! This helped me get my LG 29UC97C-B working on my Mac Pro with Dual-Link DVI-I connectors connected to the HDMI ports on the LG monitors via an adapter. However, I had to also use the patch referred to by Icepeek. Both steps were necessary to get the monitors working perfectly.