[ubuntu] Headphone port at front of computer does not work

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http://ubuntuforums.org – Hi, I have a computer case which has two USB ports, a red microphone port, and a green headphone part at the front of the computer. The USB ports work fine, I haven't tested the microphone port as I haven't needed to use it, and the headphone port does not work. Instead, I have to plug in my speakers or earphones at the back of the computer to get the sound to work! Please help, thanks. Results from speaker-test Code: Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size rang (Hardware)