Audio problem when connecting the PC to the TV via HDMI?

I connected my PC to my TV with an HDMI cable to watch Netflix. So far, I could switch over the sound settings between my computer boxes and the TV when it came to the audio output.

Now I have replaced my graphics card and this option is no longer exists. Although I still receive a picture on my TV when it is connected via the HDMI cable to the PC. However, the PC recognizes only the computer speakers as an audio output device. How can I stop that I can see and hear Netflix on the TV?

Which graphics card do you have the

A Radeon R9 270, is that relevant?