The problem: Not all HDMI monitors have digital audio and, when they do, they tend to shut audio off, when the monitor goes to sleep, and kills any audio playback running in background.
Therefore it's desired to use rear audio port instead of monitor audio port.
The bug-
In "audio hardware setup" is a choice between "analog stereo" so that sound plays through rear port. Or "Digital stereo (HDMI)" so that sound plays through monitor audio port.
And sound does play through "analog" when chosen BUT the system always reverts back to digital HDMI on reboot requiring user to change hardware settings AGAIN after each reboot. . . 


Reproducible: Always

Steps to Reproduce:
1. Set audio hardware setting to "analog".
2. Confirm analog playback is working.
3. Reboot computer.
4. Analog playback has stopped working because hardware setting reverted back to "HDMI" and channeled audio through undesired port.
Actual Results:  
Audio playback, through rear port, stopped working.

Expected Results:  
Audio playback, through rear port, to continue working after reboot.

Dell Inspiron 600.
Kubuntu 13.10
Dell HDMI monitor.