You should probably remove the model=mb5 line. It's quirked
automatically now:
https://github.com/torvalds/linux/commit/1a97b7f22774b454531f013638b181803fba470f
I see another MB5,2 owner suggested that headphones work after cold
boot, but not after reboot. Is that true for you?
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1343020
Title:
Realtek ALC889A No sound output
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