Just a thought!
When I grepped for 5c I found some non-obvious things that make sense with respect to the people that implemented the drivers:
[jutz@localhost mntgto]$ find . -name \*.h -exec grep -Hn AC97 {} \; | grep -i 5C
./alsa/alsa-driver-1.0.14rc2/sound/include/ac97_codec.h:283:#define AC97_AD_TEST2 0x5c /* undocumented test register 2 */
./alsa/alsa-driver-1.0.14rc2/sound/include/ac97_codec.h:299:#define AC97_CXR_AUDIO_MISC 0x5c
but as near as I can tell it’s called ‘vendor reserved’
(AC ’97 Component Specification p62 – ‘Vendor Reserved Registers 5A=5Fh, 70h – 7Ah)
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