1. Always on auto-dimming, ie. when looking at the pull-down notification bar it will darken, and then brighten when you exit out (there in videos too, distracting). Maybe caused by Intel display power saver (dpst) and/or content adaptive brightness (cabc)?
2. Also another video problem, had to enable "Disable HW overlays" in developer options as video would look washed out (in 2.35:1 videos black bars would be grey...). Needs to be re-enabled every reboot. Feel stuck on version YB1-X90F-161104, as I'm worried that if I update the "Disable HW overlays" fix will stop working.
3. Mr Magoo level DPI setting, jumbo icons in apps etc., which apparently can be changed but would mess with the touch pad...
4. Less of an issue, but still annoying. "Fit to height" in video players is useless, as the Yoga Book adds a black bar on the right hand side blocking picture info;