First, in my preinstalled Ubuntu 14 there were sound devices visible but they were not giving out sound.
After a system resume from suspended state or sleep I received a dialog box asking if I have headphone or headset, I didn't plug in neither one.
I went on to upgrade to Ubuntu 16 and from then on I had only dummy sound card.
Tested if there is a hardware problem with Dell's diagnostic tool that can be booted and from there I was able to get sound.
Went through myriads of forums, troubleshooters but without any result.
1 Answer
I have reseted to factory default, with preinstalled OS, formated the drives and installed new Ubuntu, nothing seemed to help.
Even after doing this troubleshooter until steps 4 I didn't realized any advancement.
Interestingly when I gave it up and wanted to install a different OS, I tackled between UEFI and Legacy modes and had some failed booting attempts from my usb stick, so went back to my installed Ubuntu and viola I hear a startup sound!!!
This ubuntu was version 14 so I upgraded it to 16 and I still have the sound working!
Only that the sound indicator disappeared but I got it back easily by an askubuntu answer.
