same situation, dell inspiron 15r, windows upgraded to 8.1, the sound stop working via hdmi, I hope Dell quickly correct the situation and not be limited only to recommend that not install windows 8.1, it is not what I expect from a laptop that buy new 2 months ago
Hdmi audio is not related to audio drivers but to video. To solve the problem simply go to Dell support page, download video drivers for your laptop and install them. Windows will try to tell you, that you already have drivers, that are newer that the ones you are trying to install. Ignore the message and continue with original drivers installation. Audio will be available after reboot. Worked for me.
Hi, I was able to fix the issue just installing the Intel driver.
Unfortunately it is not clear how to understand the right AMD raedon drivers version.