21:9 (2560x1080) ultrawide monitor Macbook Air doesn't work after macOS Sierra

Question

Level 1

9 points

21:9 (2560x1080) ultrawide monitor Macbook Air doesn't work after macOS Sierra

I'm having trouble with my LG 29UM58-P.

After installing macOS Sierra, Switchresx (4.5.3) doesn't have my custom resolution 2560x1080 anymore. I already tried to uninstall Switchresx and made new custom resolutions but it didn't help... First it didn't save my custom resolutions and then it said 'not installed' or 'not activated - invalid?'. Someone also said if you made an extra account on your mac and then set the custom resolutions, you could then use it in your normal macaccount but it also didn't work..

I tried (almost) everything.. before the software update it did work just fine. Oh and also I'm using HDMI to a mini displayport.

Could anyone help me out here?

Thanks a lot !

MacBook Air (13-inch, Early 2014), macOS Sierra (10.12)

Posted on Sep 22, 2016 3:34 PM

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Answer 1

Namolmes

Level 1

10 points

Oct 8, 2016 2:17 PM in response to FAUVL

Hey man, Same here. I am going through the exact same thing here. I have a 2013 MacBook Air and just bought the exact same display. I am on MacOS Sierra as well.

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Answer 2

K Shaffer

Level 8

36,022 points

Oct 14, 2016 6:16 AM in response to FAUVL

If you've an issue that may pertain to an awaited update or upgrade to

a third-party software application, you may wish to contact that maker

to see what their recommendations are.

In this case, contact SwitchResX screen resolution control software maker:

http://www.madrau.com/index.html Be sure you are using version 4.6 for

macOS Sierra 10.12. (for older versions: please click on • this page.)

Download

Note the need to temporarily disable SIP to install: (details incl. how-to)

macOS 10.11 and above

I've not used this software for quite some time; appears a license is retail

purchase and some updates after that are free, for version 4 users.

Contact the maker to ask questions, there is a form in their web site.

Good luck! 🙂

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Answer 3

Oct 14, 2016 5:04 AM in response to FAUVL

The only solution that worked to my was: http://terrislinenbach.blogspot.com.br/2015/12/running-lg-29um57-p-on-old-macboo k-pro.html

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Answer 4

FAUVL Author

Level 1

9 points

Oct 14, 2016 6:16 AM in response to FAUVL

Hey guys, thanks for your answers ! 🙂

I recently found my solution.

I removed Switchresx, first I did uninstall Switchresx, but it was not totally removed.

The things you need to remove are all the maps/folders related to Switchresx.

They are in:

/Library/Preferences/
/Library/Application Support/
/Library/Caches/

After that I installed Switchresx and temporarily disabled SIP, made my custom resolution and enabled SIP.

My monitor is now working as it should !

If you're having the same problem, try this !

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Answer 5

K Shaffer

Level 8

36,022 points

Oct 14, 2016 11:59 AM in response to FAUVL

Yes that was a detail outlined in a link, posted above:

Note the need to temporarily disable SIP to install: (details incl. how-to)

macOS 10.11 and above

Glad to see you were able to make it work correctly to control settings. 🙂

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Answer 6

tEEonEdk

Level 1

5 points

Nov 25, 2016 4:04 AM in response to FAUVL

When using SwitchresX - do you find the quality of the display, particularly fonts etc. to be as good as the built in display?

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Answer 7

FAUVL Author

Level 1

9 points

Feb 4, 2017 2:18 AM in response to tEEonEdk

Sorry for the late response, but yes, the quality is the same as your built in display when using SwitchresX. But only when you have the right custom resolution of course.

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