ThinkPad Pro Dock

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Lenovo FRU P/N: 04W3948

Features:

  • 1x VGA port
  • 1x DVI-D port (single-link), 1x DisplayPort
  • 3x USB 2.0 ports, one port supports always-on USB charging
  • 3x USB 3.0 ports
  • 10/100/1000 Gigabit Ethernet port
  • Stereo/Microphone Combo Audio Port (4-pin TRRS connector with CTIA standard pinout, details: http://pinoutsguide.com/HeadsetsHeadphones/samsung_moment_pinout.shtml)
  • Key lock (to secure system to the Dock)
  • Kensington cable lock slot (to secure Dock to the desk)

Linux dock audio

When headphones are plugged into the docking station, the speakers are muted but no sound is played through the headphones. This is reportedly fixed in Linux kernel 3.16. With older kernels, such as 3.13 that is shipped with Ubuntu 14.04, a workaround is available. Details are here: https://bugzilla.redhat.com/show_bug.cgi?id=1101386#c10

The bug was reported for a T440s, but it probably applies to all Intel Haswell based ThinkPads. The magic values are slightly different for each model though.

Supported ThinkPads

  • ThinkPad X240
  • ThinkPad T440 Integrated graphics models only (Discrete graphics models not compatible)
  • ThinkPad T440p
  • ThinkPad T440s Integrated graphics models only (Discrete graphics models not compatible)
  • ThinkPad T540p