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There was a Lenovo docking station compatible with the T420 (around 2012). The headphone Jack had shrieky noise on it whenever the Gigabit Ethernet connection
by dapperdrake 2y ago
There was a Lenovo docking station compatible with the T420 (around 2012). The headphone Jack had shrieky noise on it whenever the Gigabit Ethernet connection got going. Took a while to figure that one out.
The other two docking stations were built differently and had the wires run somewhere else.
EDIT: Typo