It turns out it was all Alsa's fault for not printing out a warning:
CAUTION!!! If you don't want to connect to the front audio header,
pins 5 & 6, 9 & 10 have to be jumpered in order to have signal output
directed to the rear audio ports. Otherwise, the Line-Out connector on
the back pane
Elimar> Tell us the output of...
$ cat /proc/asound/cards
0 [SI7012 ]: ICH - SiS SI7012
SiS SI7012 with ALC650F at irq 18
$ aplay -l
List of PLAYBACK Hardware Devices
card 0: SI7012 [SiS SI7012], device 0: Intel ICH [SiS SI7012]
Subdevices: 1/1
Subdevice
2 matches
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