This is one I never thought I'd need to deal with until I got myself NEON subscription. Since NEON doesn't cast over Chromecast I need to hook up my PC to the TV with a cable.
I've got an ASUS Radeon HD7850 graphics card with 1 x HDMI port (that I used for the primary display) and 1 x DisplayPort that I want to use for the TV.
The TV only has HDMI inputs.
Constraint - I often use the primary display speakers, so the single HDMI port has to be used for the primary display.
Question - will a simple passive DisplayPort to HDMI adapter allow sound passthrough to my TV?