No sound on HDMI connected to lightning port on Macbook Pro A1286

[kalpana]

Hi,

I'm new to Ubuntu. I've just installed 22.04 with desktop on my old macbook which I plan to use as an HTPC. My macbook pro is an old A1286. Everything works great with one exception. I have HD video working with the HDMI connection but there is no sound. I also don´t have the HDMI connection listed in the sound options when I click it. My TV doesn´t have a separate audio input associated with the video input so using the audio out on the mackbook is not an option.

Can someone help me?

Thanks