you have to post the pulseaudio log and ask the pulseaudio developer

the module-switch-on-port-available switch to other port when the active
port is unplugged (e.g driver know the headphone or line out and some
hdmi is unplugged)


        active profile: <output:analog-stereo+input:analog-stereo>
        sinks:
                alsa_output.pci-0000_00_05.0.analog-stereo/#0: Eingebautes 
Audio Analog Stereo
        sources:
                alsa_output.pci-0000_00_05.0.analog-stereo.monitor/#0: Monitor 
of Eingebautes Audio Analog Stereo
                alsa_input.pci-0000_00_05.0.analog-stereo/#1: Eingebautes Audio 
Analog Stereo
        ports:
                analog-output: Analoge Ausgabe (priority 9900, available: 
unknown)
                        properties:
                                
                analog-output-headphones: Kopfhörer (priority 9000, available: 
no)
                        properties:
                                
                analog-input-microphone-front: Mikrofon vorne (priority 8500, 
available: no)
                        properties:
                                
                analog-input-microphone-rear: Mikrofon hinten (priority 8200, 
available: yes)
                        properties:
                                
                analog-input-linein: Line-Eingang (priority 8100, available: no)
                        properties:
                                
                iec958-stereo-output: Digitaler Ausgang (S/PDIF) (priority 0, 
available: unknown)
                        properties:
                                
    index: 1
        name: <alsa_card.pci-0000_02_00.1>
        driver: <module-alsa-card.c>
        owner module: 5
        properties:
                alsa.card = "1"
                alsa.card_name = "HD-Audio Generic"
                alsa.long_card_name = "HD-Audio Generic at 0xdffbc000 irq 44"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:02:00.1"
                sysfs.path = 
"/devices/pci0000:00/0000:00:09.0/0000:02:00.1/sound/card1"
                device.bus = "pci"
                device.vendor.id = "1002"
                device.vendor.name = "Advanced Micro Devices [AMD] nee ATI"
                device.product.name = "Cedar HDMI Audio [Radeon HD 5400/6300 
Series]"
                device.string = "1"
                device.description = "Cedar HDMI Audio [Radeon HD 5400/6300 
Series]"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                output:hdmi-stereo: Digital Stereo (HDMI) Ausgang (priority 
5400)
                off: Aus (priority 0)
        active profile: <output:hdmi-stereo>
        sinks:
                alsa_output.pci-0000_02_00.1.hdmi-stereo/#1: Cedar HDMI Audio 
[Radeon HD 5400/6300 Series] Digital Stereo (HDMI)
        sources:
                alsa_output.pci-0000_02_00.1.hdmi-stereo.monitor/#2: Monitor of 
Cedar HDMI Audio [Radeon HD 5400/6300 Series] Digital Stereo (HDMI)
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, available: no)
                        properties:

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https://bugs.launchpad.net/bugs/1107203

Title:
  Sound stops working after service lightdm restart

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