I'm happy to report that a test kernel package provided to me by Stefan
Bader now gives the following in /dev/sndstat:

Card config: 
HDA Intel at 0xee240000 irq 17
ThinkPad Console Audio Control at EC reg 0x30, fw 79HT50WW-1.07

[...]

Mixers:
0: Analog Devices AD1981
29: ThinkPad EC 79HT50WW-1.07

The mixer is accessible using 'alsamixer -c 29', in read-only mode as
expected.

Next will be to figure out how to get the desktop to pay attention to
the status of this mixer.

-- 
No notification when sliding audio volume, muting volume on ThinkPad X23, X24, 
X31, X32, X41, X60, T22, T40, T42, T60, R50e, R51, R52
https://bugs.launchpad.net/bugs/357673
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