Ok, I've at least found a workaround, but the bug is still present:
Manually loading an alsa source in /etc/pulse/default.pa works ("load-
module module-alsa-source device=hw:0,0").
This adds an "Internal Audio" input device, in additon to the auto-
loaded (udev?) "Internal Audio Analog Stereo".
After configuring alsa levels with alsamixer, the manually loaded
"Internal Audio" device works for recording. The auto-loaded "Internal
Analog Stereo" device still behaves incorrectly (no sound is produced,
and selecting it misconfigures the alsa levels; they have to be
readjusted before the manual device works again).
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Pulseaudio refuses to use internal microphone input (Lenovo X300)
https://bugs.launchpad.net/bugs/434520
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