I guess I'll hijack this thread, since discussion seems to be happening here.
I'm working on getting fixes in place for the rotation issue on AOSP. The build that ElwOOD_CbGp posted was just a test to see if I was on the right track for a fix. The change I made in that build fixes L710Ts but breaks L710s. I put together a new build that won't break L710s, and if everything works, I'll try to get CM to pick up the changes so a custom kernel won't be needed. Can someone test one of these builds to make sure both rotation and uncalibrated compass orientation are correct?
Lollipop:
MediaFire Dev-Host
KitKat:
MediaFire Dev-Host
I'm not familiar with exactly what problems the L710T has, other than the rotation issue. Can someone PM me to bring me up to speed?