Recently, I ave done everything I could to turn my Raspberry Pi Model B into a laptop. After searching through several tutorials, I never could get what they wanted, plus, I was using NOOBS for my OS loader and that doesn't work well with the lapdock. Thanks to my own perserverance and plain stubborness, I have figured out how to get the Pi to work.
Parts list:
Motorola Lapdock (I used the 100 model but I can assume any type will work)
Micro HDMI female to Micro HDMI female adapter
Micro HDMI male to HDMI male
Micro USB female to USB Male
USB Female to USB Male
Raspberry Pi ( I used a model B Rev 2 which means it can be powered by USB)
An SD card with NOOBS installed
1) Connect all the cables to together.
2) Locate the reset button on the bottom. It is a small paper-clip hole. Press that button for ~5 seconds and also press down the power button on the Lapdock.
3) Press and hold the power button on the Lapdock.
4) Screen should turn on and show the gradient for NOOBS.
5) From there install the OSes if necessary.
6) Plug in an external power source to the micro USB slot in the Pi to ride through the loss of power.
7) When the OS is selected, the HDMI will turn off and so will the Lapdock's HDMI.
Repeat steps 2 and 3.
9) Screen shoould pop up with your OS of choice.