I removed the IDT driver and went to the native Windows driver and then it showed microsoft speakers and three non connected HDMI devices. Looking at the playback device info it only shows:
When I play a video on the TV the video is perfect but the audio comes from the laptop. I used the IDT High-Definition (HD) Audio Driver V. .0 from the HP driver download .
I loaded Win 7 as a fresh install thinking those drivers might work but they did not. I looked under the audio playback devices and only saw one active device, for the laptop speakers. I loaded Win 10 and tried to use the displayport but had no audio. However, I have a 2nd ProBook 6560b that I also had Win 10 on but tried Linux on it and never liked it. I accidentally hit the power button and the computer died instantly, somehow that caused the SSD to go dead. I used the free upgrade to go to Win 10 and had no issues with DisplayPort audio after the upgrade. I use a DisplayPort >HDMI adapter cable to connect them. History: I have been using a ProBook 6560b for watching internet videos on the TV for several years. I have been using DisplayPort for some time with great audio and video from a ProBook 6560b.
I do not have audio via the DisplayPort to a Samsung 4K TV.
