I noticed the other day that sound from Amarok was not working on my Acer Aspire 9410. I tried running alsamixer without any parameters and only saw a single device. After googling a bit, I ran across the following command:
alsamixer -D hw:0
When I ran this command, I was able to see more devices and sound began working. I am not sure if this is needed every time I start my laptop. I will post back the next time I boot.
I also added the following line to /etc/modprobe.d/alsa-base:
options snd-hda-intel model=auto
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