I'll be honest, I have no idea if this has ever worked before for me. I have been through a total of three labtops (Not recently or within the same year I promise! o.o), the first was a really old one much bigger then my current and even it did not have an HDMI driver. My 2nd did not either, not sure if that was just because it was loaded with windows 8 when I first bought it. My third one, my current one was bought with windows 8.1 as the base installed software. But even this computer does not have an HDMI drive or option, what all these computers had in comman however is this - they all used Realtek's HD audio as their sound driver. I'm quite certain maybe that I am the only person with this specific problem as everyone else seems to have 'options' under their sound panels, but me... well theres nothing - not even evidence of there being an option of HDMI. Before you suggest it, I have it enabled to show disabled drivers/hidden so it still isn't there. If anyone can help me with this I would greatly appreciate it, this has been a headache for me for quite some time. (Rather bathling really... three labtops, one not even in the same generation didn't have it and was Windows 7 - just the same audio problem).
Screenshots:
http://i295.photobucket.com/albums/mm154/luppi7/SceenshotC.png
http://i295.photobucket.com/albums/mm154/luppi7/ScreenshotB.png
http://i295.photobucket.com/albums/mm154/luppi7/screenshotA.png