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4d1350f
(Get the code!)
I was able to play around with hda analyzer and confirm pretty much the same thing as comment #3 describes.
For my laptop, rear is for top speakers on Node 0x14, front is bottom speakers on Node 0x13,
On my system (dv6tqe), Node 0x0f defaults to output selector 0x14 which seems correct, however Node 0x14 is muted, which is why I get sound from bottom only. Once I unmute val[0] and val[1] at Node 0x14, I get all four speakers working. I can even fade between them in the control panel.
However, as soon as I adjust the volume in application or system (via panel or keyboard) the top speakers get muted again. I can reenable them by muting and unmuting 0x14 in hda analyzer. I"m assuming it's muted but the GUI was not updated. So the setting is not permanent. It's undone as soon as volume is adjusted rendering this workaround useless.
I have not tested the impact on the headphone jacks but I assume they should be fine as I did nothing but unmute the top speakers (or rear in control panel, which feels right because the bottom spekers are in the front of the laptop). I can attach teh output of bug.txt if that would help.
Also, I do not have any changes done to alsa-base.conf. I tried several but commented them out. I am not sure how to ensure everything is vanilla but I believe it to be. If there's a way to ensure everything is default and vanilla let me know so I am not giving information that only works on my modified configuration