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0e1f616
(Get the code!)
I've been through this whole thread now. New Optiplex 380, Xubuntu 10.04 installed. The "no sound" reports may not be quite accurate as I find that there is sound but it is coming out of the internal PC speaker. Barely audible even with all volume levels set to max. The sound chip is identified as ALC269Q in dmesg.
I tried the "hda-verb" fix, but it made no difference.
The "HDA-analyzer" fix does turn on the sound to the line out (rear, green) and headphone (front panel) jacks.
What HDA-analyzer shows on startup is that the headphone jack is connected to the second mixer, while the line out is connected to the first. Switching the headphone jack over to the same mixer as the line out seems to be what activates the sound.
I tried running apport-collect as requested but launchpad denied permission to report the results, saying that the problem "is closed." I don't know what's up with that, as it's obviously still open.