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They mentioned during the presentation that they need the new display controller on the M4 to drive the new dual panel display.

• AlanYx 2y ago
  That's really an underrated part of the announcement. It sounds like they're moving the entire display TCON on-chip.
• paulmd 2y ago
  Interestingly that probably means having proper support for 2 external displayport on MBA as well, I'd assume...