I'm not yet sure about the screen tearing. Did you get the tearing/flickering on the v8 testing builds? I'm also going to do v8 builds when there are kernel changes shortly. v9 is still very much a work in progress, with some kodi issues we have to tackle. On the release page, I state the following:
hi John, before I get into the main screen of Libreelec, that means right after booting the screen tear appears. It's so difficult to see, read and choose the option being displayed. It happens only with your test builds and also the latest test build from afl1.
We know that it's still in pre alpha stage of development. I was just reporting the problem being faced with my box. It has got nothing to do with complaining. Thanks developers for understanding us so well.
Keep up the good work.