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Reply To: Diagnostic query: Unexpected kernel panic on macOS Sequoia 15.1 after waking (1794706908)
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Emily HartWhile Continuity features (Apple Watch Unlock, Universal Control) exercise the Bluetooth HCI and IOBluetoothFamily, they do not invoke AppleThunderboltNHI or IOPlatformPluginFamily power assertions during the dark-wake transition. The panic signature AppleThunderboltNHI::assertionFailed indicates a Thunderbolt controller (TBT/USB4 retimer) firmware handshake failure exiting D3cold, not a battery or Bluetooth subsystem event. CLI Check: system_profiler SPThunderboltDataType | grep -A2 "Firmware Version" — verify the controller NVM is at the latest Apple-shipped version (e.g., 29.1+ for Titan Ridge/Calypso); if outdated, force a DFU firmware update via sudo /usr/libexec/PlistBuddy -c "Print :IOKitPersonalities:AppleThunderboltNHI:FirmwareVersion" /System/Library/Extensions/IOThunderboltFamily.kext/Contents/PlugIns/AppleThunderboltNHI.kext/Contents/Info.plist comparison against ioreg -l -w0 | grep -i firmwareversion.