To utilize DisplayPort over USB-C/Thunderbolt alternative mode you will need to enable the setting in the BIOS. Look for a setting that says DDI (Digital Interface) to mDP (Mini DisplayPort) or DDI to TBT (Thunderbolt). To utilize DisplayPort over USB-C/Thuderbolt make sure the BIOS is set to "DDI to TBT". Save and restart. After restarting you should be ale to plug-in a compatible display adapter or docking station and have it just work for the most part. You may need to find the display key to change output devices. This will be done by holding down the FN key and finding the right special function key on the keyboard for your particular model (F1-F12). If you need more specific documentation on this please contact support with your model # and let us know exactly what you are trying to do (utilize the DisplayPort over USB-C/Thunderbolt port, and ideally with which docking station and/or adapter).
Documentation For Specific Models
Penguin y=mx+b GNU/Linux Laptop (N141WU, note: no PD support on this model):
Step 1: Turn the computer on and hit the F2 key repeatedly until the BIOS comes up
Step 2: Under the Advanced Tab go to Intel(R) Thunderbolt the Security Level should be set to [Unique ID]
Step 3: Under the Advanced Tab go to Intel Thunderbolt Technology and set to [Enabled]
Step 4: Under the Advanced Tab go to Advanced Chipset Control and set DDI Control to [DDI to TBT]
Step 5: Under the Exit tab select Save Changes And Reset
Once the system boots up normally assuming you have a sufficient recent distribution you can go to the control center/setting and click on Displays to configure the output to your liking. Mirror, etc.
Notes: At least the J2, J3, and M3 support power and DisplayPort over USB-C/Thunderbolt