Quote:
Originally Posted by pazos
If you do it again with the same results you can repeat a 3rd time and while you're at it grab a video with scrcpy and paste it somewhere online.
I'm doing this android thingy maintenance for a few years and I've hear a lot of weird feedback but I'm fairly confident you'll get the results you want with the steps above. Or, at least, you'll get us a nice video of an rara avis 
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Rara avis indeed. Something along the lines of the Dodo.
Alas, no amount of repeating the directions (over on XDA I'm known for my painfully explicit and detailed directions, so...) gave me any joy. Quite the contrary.
I was hoping for at least entertainment value in all this but was disappointed to find that scrcpy did not care for my tablet (running CM 13, so perhaps the drivers, etc., are not exactly the "expected" ones). I thought about using my daily-driver tablet camera to film the extravaganza but decided not to go there. So no questionable videos of the app performing somersaults while it fights it out with the OS.
On that note, I found that my daily-driver tablet (which boots in portrait) has no problem with the app. A happy discovery there.
Better still, I have found
an acceptable solution for the problematic device. I tried a variety of apps designed for specific rotation control. The most effective of these use Accessibility settings. The one that worked best for me is
Ultimate Rotation Control. Set globally to "Forced autorotate" with a custom setting for Koreader as "portrait" (and..."landscape" for Kodi...), the behavior exactly mimics that on my other tablet. With a global setting of just "autorotate" there is some indecision and brief tumbling when the app starts, although it does straighten up and fly right in the end.
So, all's well that ends well (I guess).