Didn’t see a board for ARM64 (experimental) build target.
Unity 2017.1.7
.NET 4
IL2CPP
XR enabled
simple scene
Galaxy Note5 Gear VR device
What I did:
Enabled ARM64 target build architecture (for Android)
What I got:
Device does not enter VR mode.
Confirmed that disabling ARM64 and leaving everything else the same resolves issue.