After upgrading my Nvidia drivers to the latest Nvidia GPU drivers (Nvidia 184.108.40.20638), I've lost the audio features on my TV when I hook up my DisplayPort -> HDMI converter from the laptop to the TV.
1) Firstly, do check the other article to ensure that proper setup for your laptop's audio setting is correctly configured before doing the steps provided below. (Audio DisplayPort -> HDMI Setup)
If you laptop audio settings are already configured correctly via KB article (Audio DisplayPort -> HDMI setup) and you are still having no audio output to the TV,do check if your DisplayPort -> HDMI converter supports Video and Audio output. Please view our Lenovo recommended DisplayPort -> HDMI converter here
2) Download the previous version of the drivers 220.127.116.1155 via Link below.