macOS kernel return 0xE000800E (kIOFireWireInsufficientPower): meaning

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Available FireWire bus power was insufficient for the requested device or operation context.

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kIOFireWireLowCableVoltage	kIOFireWireOutOfTLabels

kIOFireWireInsufficientPower

Power budget, not packet bandwidth

kIOFireWireInsufficientPower signals that the FireWire-family stack does not have sufficient power for the relevant device or operation. It must not be confused with isochronous bandwidth allocation: electrical power capacity and reserved bus bandwidth are different resources and are represented by different conditions.

The diagnosis needs the actual bus-power source, device requirements, topology, and timing. A device may appear intermittently if it starts from a low-power state, draws differently during initialization, or shares a path with other bus-powered equipment. Reducing a stream's payload does not necessarily alter the electrical limit.

Separate power from transport state

Capture bus-power source, attached devices, connection order, and any externally powered hubs or adapters.
Check whether the status appears during discovery, device startup, or a later high-load operation.
Compare with kIOFireWireLowCableVoltage when the controller also reports a voltage condition.
Do not use isochronous bandwidth release as the primary response unless a separate bandwidth allocation status confirms that resource is exhausted.

References

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