https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/Procfile.txt
AC97 Codec Information
----------------------
card*/codec97#*/ac97#?-?
Shows the general information of this AC97 codec chip, such as
name, capabilities, set up.
card*/codec97#0/ac97#?-?+regs
Shows the AC97 register dump. Useful for debugging.
When CONFIG_SND_DEBUG is enabled, you can write to this file for
changing an AC97 register directly. Pass two hex numbers.
For example,
# echo 02 9f1f > /proc/asound/card0/codec97#0/ac97#0-0+regs
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https://bugs.launchpad.net/bugs/893210
Title:
[Dell OptiPlex GX620 - AD1981b, playback] No sound at all
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