Some weeks ago my external speakers and microphone worked without problem then, i received a PureOS upgrade and speaker and microphone did not work after reboot even they were not detected by pulseaudio. I am not sure what is my sound card but now, i can only listen to music throught my graphic card thanks to hdmi support that is detected by pulseaudio.
I am not sure what is my original sound card because i had not problems time before but i have made "lshw" and i found this:
*-multimedia
description: Audio device
product: FCH Azalia Controller
vendor: Advanced Micro Devices, Inc. [AMD]
physical id: 14.2
bus info: pci@0000:00:14.2
version: 01
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:16 memory:fe300000-fe303fff