I have a (Dual booted) Dell Inspiron N5110 with
IDT High Definition Audio CODEC and Windows 7.
In Windows 7, I can hear sound from the speakers, but when I plug headphones in, I can't hear anything through either playback device.
In Ubuntu, I can hear sound from the speakers, and when I plug headphones in I can hear the sound through the headphones. This is what I want to happen in Windows 7.
I have tried using the test function on both the "Headphones / Speakers" and the "Communication Headphones" when I have headphones plugged in (neither work). When I click the sound icon in my system tray when I have headphones plugged in, I can see the green line moving up and down when sound is playing, but I can't hear a thing.
This is what my sound window looks like in windows 7: