90-degree rotation for Portrait monitor broken

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90-degree rotation for Portrait monitor broken

Setup:

Brand-new Retina MBP 15", 16GB RAM, 512GB SSD, just received from UPS
OSX 10.10.3
Intel Iris Pro 1536 MB
Two external displays, each connected to a separate lightning port on the MBP.
- Main: NEC EA244WMi, 1920 x 1200, landscape
- Side: Samsung S19B420, set up in portrait mode. Landscape resolution is 1366 x 768.

When I go into System Preferences, Displays, my displays are detected correctly. Now, since my Samsung S19B420 is set up in portrait mode, naturally I want to configure the display with 90-degree rotation so that I can get text in portrait mode. In the default "Standard" rotation setting, the desktop and menu bar fills the entire portrait screen, but sideways. If I change the rotation to "90 degrees", then the output correctly gets rotated, but only half my screen is used, and the max available resolution becomes 1024 x 768, not 768 x 1366 as I would expect!

Now the funny thing is that I had an older MBP, say early 2014, with OS X 10.9.5 installed, and this had no issues with the 90 degree rotation.... it would fill the whole screen.

Can anyone help me restore proper portrait monitor full screen usage at 768 x 1366 on Yosemite? Thanks.

MacBook Pro (Retina, 15-inch, Mid 2015), OS X Yosemite (10.10.3), 16GB, 512GB

Posted on Jul 21, 2015 6:14 PM

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Answer 1

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elvenkind Author

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Jul 22, 2015 12:30 AM in response to elvenkind

I found the solution:

OS X Yosemite: Adjust your display’s resolution

You have to Option-click when you hit "Scaled" option in the display dialog, and not when you hit the "display" in Sys Prefs or anywhere else. Only then will you see additional resolutions. I had tried hitting Option-click but it requires really high precision.

Not sure why the default resolutions are so low though, and why hitting Option was needed. This took too much time to figure out.

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