But I can't see pixels turning on and off like others are noticing. Also I've long suspected that my headlight alignment is out. How does the alignment work with matrix headlights. Is there some feedback from the cameras or does it just rely on everything being properly aligned already?
It's quite hard to see the beam pattern unless you are on a very dark road with hedges/trees/buildings at the sides. A bit of mist or fog makes it much easier to see.
TL;DR - I suspect the low beam alignment and adaptive high beams have little or no relevance to each other.
(Disclaimer: This is guesswork on my part, with no proof of accuracy). I suspect the headlight alignment and adaptive high beams are completely separate software modules.
The headlights are effectively a grid of individual LEDs, which have a set angle and direction they point. The low beam alignment will set a certain number of those LEDs to be on or off, based on what is set in the Service menu or automatically when the levelling system is activated. I suspect this is stored as its own data point in the car system. The individual light pixels are quite easy to see if you park close to a wall with the lights on; you can see the very square edges.
Adaptive high beams are probably a new software module which takes over when the high beams are activated. This will turn on all the LEDs when the camera cannot see any cars/lights in its line of sight. Imagine drawing a set of grid lines over an image from the camera. Each LED will have it's own point of reference on the grid. If there's a trigger in a grid square, the LED pointing at that square will be turned off. As the front camera is fixed, it's relatively trivial to set up a set of grid references for where each light points. Security cameras use a similar setup for masking areas of motion to be monitored (or ignored).
If there's a car in front of me when moving from a dark road to a fully lit one with street lights, I can see the bottom few rows of LEDs on my car come back on. They were off for the high beam blocking out the car in front, but revert to the low beam "alignment" when adaptive is deactivated.
Random image I found online to demonstrate:
Edit: Added a better example image: