device.description = "Built-in Audio Analog Stereo"
                alsa.mixer_name = "Analog Devices AD1981"
                alsa.components = "HDA:11d41981,11790311,00100200 
HDA:11c13026,11790001,00100700"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        ports:
                analog-output: Analog Output (priority 9900, available: unknown)
                        properties:
                                
                analog-output-headphones: Headphones (priority 9000, available: 
unknown)
                        properties:
                                
        active port: <analog-output-headphones>



pulseaudio use Jack detection kcontrol to switch port

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output-headphones.conf


you need to use latest alsa driver


https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=bd450dcc357646cc277c560ab24b35f940efa585

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https://bugs.launchpad.net/bugs/1161523

Title:
  [PORTEGE M500, Analog Devices AD1981, Speaker, Internal] No sound at
  all

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