Reply To: Apple Pencil Pro squeeze gesture stops working inside Notes after screen protector swap
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Rachel KimThe M4 iPad Pro’s Pencil Pro pairing stores a per-accessory calibration blob that includes baseline self-capacitance offsets for the squeeze electrodes; a new protector changes the parasitic capacitance enough to invalidate that baseline. CLI check: defaults read com.apple.PencilPro CalibrationData 2>/dev/null | xxd -r -p | plutil -p - (on macOS via USB) to inspect stored baselineCapacitancePicoFarads vs. live readings in IOHIDEventSystem debug logs. Recovery: Unpair Pencil (Settings → Bluetooth → “i” → Forget) → restart iPad → re-pair with the protector installed so the initial calibration captures the new dielectric constant; if squeeze still misses at the tip, the protector’s edge may be grounding the fringe field—trim 1 mm off the protector’s flat-side corners near the charging edge.