--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pirelli/vibrator-ctrl	Sat May 29 07:42:17 2021 +0000
@@ -0,0 +1,15 @@
+Pirelli fw behaviour on incoming calls: when the vibrating alert mode is
+selected, the vibrator runs in pulses, each pulse appears to be 1 s in total
+period, duty cycle too difficult to determine.  If the alert mode is set to
+vibe and ring, then these vibrator cycles run in parallel with the ringer on/off
+cycles - the vibrator cycle is faster, and the two cycles appear to be
+independent, as in not explicitly synchronized.  If the alert mode is set to
+vibe then ring, in that case only one vibration pulse is produced, followed by
+ringing only, with no more vibration.
+
+Pirelli fw behaviour on incoming SMS: when the alert mode is vibrate only, then
+a total of 4 vibration pulses are produced.  If the alert mode is set to vibe
+and ring, then only 3 vibration pulses are produced instead of 4, and this
+vibration cycle coincides with SMS alert ringtone playing.  If the alert mode
+is set to vibe then ring, in that case only one vibration pulse is produced,
+followed by the SMS alert ringtone.