Where does Android boot vibrate? How does one disable it?

Frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager. java public boolean javasmhapticfeedbacklw (WindowState win, int partition tid, boolean always ){....... case HapticFeedbackConstants. SAFE_MODE_DISABLED: return; // start in normal mode. If you do not want to vibrate, directly return; pattern = mSafeModeDisabledVibePattern; break; case HapticFeedbackConstants. SAFE_MODE_ENABLED: return; // start in safe mode. If you do not want to vibrate, directly return; pattern = mSafeModeEnabledVibePattern; break; default: return false ;}}