What is "Analog Output - Built-in Audio"?

Hi,
In Gnome System Settings -> Sound there are three pulse sinks: HDMI (Built-in Audio), Speakers (Built-in Audio), and Analog Audio (Built-in Audio).
When I plug-in headphones into the laptop, "Speakers" change to "Headphones". The behavior is what I want, but I was just confused as to what "Analog Audio" does? As far as I can tell it doesn't do anything. In Ubuntu 13.10 I didn't have the Analog Audio sink.
Last edited by SimFox3 (2014-01-07 01:48:31)

# 'pactl list'. Again the analog-stereo port is the one I need to know more info about:
analog-input-internal-mic: Internal Microphone (priority: 8900, latency offset: 0 usec)
                        Properties:
                                device.icon_name = "audio-input-microphone"
                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1+input:analog-stereo
                analog-input-mic: Microphone (priority: 8700, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "audio-input-microphone"
                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1+input:analog-stereo
                analog-output: Analog Output (priority: 9900, latency offset: 0 usec)
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
                analog-output-speaker: Speakers (priority: 10000, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "audio-speakers"
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
                analog-output-headphones: Headphones (priority: 9000, latency offset: 0 usec, available)
                        Properties:
                                device.icon_name = "audio-headphones"
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
                hdmi-output-0: HDMI / DisplayPort (priority: 5900, latency offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "ASUS PB278"
                        Part of profile(s): output:hdmi-stereo, output:hdmi-stereo+input:analog-stereo
                hdmi-output-1: HDMI / DisplayPort 2 (priority: 5800, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra1, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1, output:hdmi-surround-extra1+input:analog-stereo
# dmesg | grep sound - doesn't list anything to do with analog.
[    3.920668] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
[    3.921853] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[    3.922829] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[    3.923004] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input

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