[kubuntu] Front Audio Not Working

view story

http://ubuntuforums.org – Hello everyone. As the title says, for some reason I can't hear anything when I plug headphones to the front audio. I thought maybe my hardware is defective since I googled and didn't find anything regarding the same problem with the same motherboard I have, but everything works fine when I boot Windows 7. In Kubuntu the back panel audio works just fine, even the front record works, just the front audio is problematic. I tried downloading drivers, checking it's not muted, even upgraded the kernel to 3.5, but it still doesn't work. My motherboard is Gigabyte GA-Z77-D3H, and the case is A (Hardware)