Just as other Windows devices, it is due to the improper physical condition and the outdated or missing or corrupted HDMI audio drivers.
When you want to connect the Television or surround sound speaker to your Dell, ASUS, Lenovo or any other brand of PC through HDMI, but there is no sound from the HDTV devices, or you even cannot find your HDMI audio devices in Playback devices, hence it is also obvious that your HDMI audio is not work.
