Comment 63 for bug 893210

             device.vendor.name = "Intel Corporation"
                device.product.id = "27de"
                device.product.name = "OptiPlex GX620"
                device.form_factor = "internal"
                device.string = "front:0"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "65536"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analogue Stereo"
                device.description = "Built-in Audio Analogue Stereo"
                alsa.mixer_name = "Analog Devices AD1981B"
                alsa.components = "AC97a:41445374"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Ports:
                analog-output-headphones;output-amplifier-on: Headphones / Amplifier (priority: 9010)
                analog-output-headphones;output-amplifier-off: Headphones / No Amplifier (priority: 9000)

        Active Port: analog-output-headphones;output-amplifier-off

the port is different from those ac97 codec in virtualbox 4.x or those ac97 codec without headphone volume control