Your BIOS is broken and yanuzz comment seems reasonable.
If it works, using user_pin_configs would probably a better workaround for a
broken BIOS.
The user_pin_config for an Internal Mic should be (if I'm calculating right) :
0x90A70011
That is, please try
# echo 0x19 0x90A70011 > /sys/class/sound/hwC0D0/user_pin_configs
# echo 1 > /sys/class/sound/hwC0D0/reconfig
Log out and log in again and try it. Thanks in advance!
** Changed in: alsa-driver (Ubuntu)
Status: Triaged => Incomplete
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[Realtek ALC269] internal mic does not work
https://bugs.launchpad.net/bugs/585858
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