Comment 51 for bug 537448

I think there is some problem with hda-analyzer 's revert feature or I don't know if some settings are automatically applied. Node 0x19 had changed from HIZ to 80 after a reboot and there was no sound in either the builtin speaker or the the headphone jack.

I had to change IN on Node 0x19 to HIZ or GRD, and now the builtin speakers and headphone jack are both functional and the speakers are automatically OFF when the headphone jack is plugged-in. (along with changes to Node 0x14 and 0x15 mentioned in comment #50)

Intuitively and by the observed behavior, Node 0x14 is the builtin left speaker out and 0x15 is the right speaker out.

After a second reboot, I have observed that Node 0x19's IN does revert back to 80 instead of staying as HIZ/GRD.