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e3ace39
(Get the code!)
Ok, here's the solution. First I ran 'modinfo thinkpad_acpi' to see what options that module supports... I did that because I have run it before and remembered that what we are looking for is one of it's options... I found that "enable" is for enable or disable of the ALSA interface to the console volume control. Disabling it solves the problem and I have sound again.
Create /etc/modprobe.
options thinkpad_acpi enable=0
... and then reboot the computer.
I'm not certain what package should contain that setting. I am sure that this is thinkpad specific, and not related to the problem mentioned above that was found on the other laptop model. I would begin debugging them in similar fashion, by stopping the pulseaudio daemon if it's even running, and then trying to run it from a terminal to see what it prints.