I have a similar problem with the ASRock Z97 Extreme4 - http://www.asrock.com/mb/Intel/Z97%20Extreme4/
Running virtualbox windows instance the sound is better, but not 100%
Also the sound is almost usable watching a youtube video, but switching to another tab with the video playing is horrid.
I have tried the above hacks with the /etc/modprobe.d/fix-sound-intel97 file, but it does not make a difference.
I have a similar problem with the ASRock Z97 Extreme4 - http:// www.asrock. com/mb/ Intel/Z97% 20Extreme4/
Running virtualbox windows instance the sound is better, but not 100%
Also the sound is almost usable watching a youtube video, but switching to another tab with the video playing is horrid.
I have tried the above hacks with the /etc/modprobe. d/fix-sound- intel97 file, but it does not make a difference.