OneMix Yoga 2S partial success

So, I’ve got Mojave working successfully on my 7 inch OneMix Yoga 2S. It’s all good, except for one tiny detail; the screen is permanently rotated 90 degrees into portrait mode. I’ve tried CMD+Option and clicking on System Preferences > Display Options, but no matter what I do, the rotation option won’t come up.

Any ideas of how to resolve this issue and get it to successfully boot in Landscape? I’m a total noob to all of this, so any help would be awesome. Thanks!

submitted by /u/martinegtk
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