I had this problem before but it stopped when I replaced the speakers. It started again recently when I was trying to make sure the bluetooth dongle would always turn on at startup. It looks like another person had a similar problem on this forum but I dont know if my settings were exactly the same.
Essentially I have two sets of speakers, one for a secondary monitor, and a default set for the computer. I would like use the default set (the monitor and those speakers go to other devices as well), but the default ones will not play sound anymore. They are on and show up in pavucontrol which says they are playing, but no sound is coming out.
lshw gives
description: Audio device
product: GM206 High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:17 memory:ed080000-ed083fff
and
description: Audio device
product: 100 Series/C230 Series Chipset Family HD Audio Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 31
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:127 memory:ed340000-ed343fff memory:ed320000-ed32ffff
with the alsa information at http://alsa-project.org/db/?f=5db4e288c0c81066e7f6831f5eeaa0673c35929f
can I ask for some help?