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I have a BenQ EX3501R monitor connected by HDMI to my MacBook Pro, which is a Early 2015 model.

The issue being that OS X gets the resolutions completely wrong - the monitors native resolution is 3440x1440 but it switches it to 6720x3780!

Alt-clicking the 'Scaled' radio box does not list the correct resolution.

For further confusion, a Mid 2012 15' MacBook Pro connecting to the same monitor via the same HDMI cable works fine. The only notable difference is that one has a GeForce chip, where as mine is Intel Iris.

Both are running latest Mojave 10.14.1

any ideas of a way to proceed?

graphic info suggested resolution osx-info display-settings

  • what you did not tell us how does the picture looks like at 6720x3780! – Ruskes Dec 3 '18 at 16:37
  • did it work on the 2015 before Mojave upgrade ? – Ruskes Dec 3 '18 at 17:11
  • @Buscar웃 it rendered, but everything was tiny and pixelated. didn't look good. I got the monitor after i upgraded the OS X to Mojave – TotalWipeOut Dec 9 '18 at 19:27
  • Having the same issue with a dell u3818dw. Native resolution is 3,840 x 1,600 pixels but that option is not available (even with alt-click). – DocWatson Feb 27 at 13:40
  • Ultimately I restarted the 'dock' that I was using and the correct resolution appeared. If you're using an adapter or dock (which, it's a mac so of course you are), unhook it/power it off and back on. – DocWatson Feb 27 at 14:15
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It might be the Monitor profile used by Mojave that needs repair.

Open the Color sync Utility in the Utility Folder

color sync utility

Verify you Monitor is showing correctly under devices.

Use the Profile First Aid.

  • you might be onto something, 53 profiles are needing repair, and on clicking Repair, it said only 2 were fixed. sigh. "The file is locked. Could not be fixed." Is there a way to run this as root? – TotalWipeOut Dec 9 '18 at 19:37

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