Seeing something similar on my laptop, when I run gnome-volume-control
the sound cuts out and pulseaudio drops my real audio device.
Restarting pulseaudio gets things working again.
80:01.0 Audio device: VIA Technologies, Inc. VT1708/A [Azalia HDAC] (VIA High
Definition Audio Controller) (rev 10)
Subsystem: Hewlett-Packard Company Device 3030
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at febfc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable-
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel <?>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
--
No sound; Output device null
https://bugs.launchpad.net/bugs/413806
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