lspci

Power not plugged in:

00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
	Subsystem: Lenovo Device 21ce
	Flags: fast devsel, IRQ 20
	Memory at f2600000 (32-bit, non-prefetchable) [size=128K]
	Memory at f262b000 (32-bit, non-prefetchable) [size=4K]
	I/O ports at 5080 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e

Power plugged in:

00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
	Subsystem: Lenovo Device 21ce
	Flags: bus master, fast devsel, latency 0, IRQ 40
	Memory at f2600000 (32-bit, non-prefetchable) [size=128K]
	Memory at f262b000 (32-bit, non-prefetchable) [size=4K]
	I/O ports at 5080 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e

Docked:

00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
	Subsystem: Lenovo Device 21ce
	Flags: bus master, fast devsel, latency 0, IRQ 40
	Memory at f2600000 (32-bit, non-prefetchable) [size=128K]
	Memory at f262b000 (32-bit, non-prefetchable) [size=4K]
	I/O ports at 5080 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e