VRB: When VRB is set to Normal or Extreme, the dynamic picture fine lines will
become more clearly, but the brightness will be reduced, and default will be "Off".
VRB Setting
VRB and FreeSync cannot be enabled at the same time. If FreeSync is
turned on, then VRB will be "Off".
When VRB is "On", Brightness, Blue Light and ACM cannot be adjusted
unless it is "Off".
VRB is enabled when Input Timing = 75Hz. If Input Timing <75Hz, VRB
is grayed out and disabled.