DP++ support?

[Jacob_Padgett]

@Jacob_Padgett

This cable is a passive adapter, so it isn’t compatible with DisplayPort Alt Mode. On the USB-C Wikipedia article, if you scroll down to the table titled “Alternate Mode protocol support matrix …”, you’ll see that DisplayPort Alt Mode is only compatible with HDMI via an active adapter. The expansion card probably uses DisplayPort Alt Mode, and if so, that would explain why the cable doesn’t work.

The table (on the Wikipedia page) is still there, you have to scroll down a bit.

So, unfortunately no, plugging a passive DP → HDMI cable into the DP adapter expansion card doesn’t work. The USB DP alt mode port just can’t send out the correct signals for HDMI (for DP++), it’s just not something the standard is capable of.