Hi, I just got the exact same problem, but not with an Acer laptop, and am very proud to have found the solution !!!
- First, be sure that your audio driver is the real Windows 8 compatible. I mean, maybe your audio works without problems, but in reality, you've not upgraded it to the official Windows 8 driver. So, because there are many chances that your audio is by Realtek, their Realtek High Definition Audio driver for Windows 8 is here :
- You must install Dolby Advanced Audio v2 for Windows 8. Quite surprisingly, I didn't find it on Dolby website, not even on my laptop's manufacturer's website (Medion, and I really wonder who ever got any useful support from them ...), but on their competitor Lenovo's website :
I thought it would only work with Lenovo computers, but it did with mine !
But, very important, don't skip step 1, because, then, step 2 won't work ! It took me a f... while to realize it !
Hope I've been useful to you.