I can get the sound to work on my Dell Latitude E6400 by poking around with various settings. But it does not stick with a reboot or restart.
Procedure to start the sound working:
- Open Sound Preferences
Change Profile to anything other than what it is
Change Profile to Analog Stereo
AH HA! (While it is unlikely that anyone else is stupid enough to have this problem, I will post this anyway. )
While looking at the kernels to make this post, I discovered that I had somehow installed TWO kernels! When I removed the older one the sound started working after reboot.
Also discovered that this computer is eleven years old and since it still works great...
Thank you developers of Linux Mint!