Use a 2 msecs switching headroom not only for slightly
delayed exiting of BTR mode, but now also for entering
it a bit before the max frame duration is exceeded.
With slowly changing time delay between successive flips
or with a bit of jitter in arrival of flips, this adapts
vblank early and
Use a 2 msecs switching headroom not only for slightly
delayed exiting of BTR mode, but now also for entering
it a bit before the max frame duration is exceeded.
With slowly changing time delay between successive flips
or with a bit of jitter in arrival of flips, this adapts
vblank early and
