I have a desktop PC running Ubuntu 16.04 in the living room in which i am facing a strange behavior concerning the front panel audio output. Yesterday, after noticing i was not having sound coming out of the jack i followed the guidelines in this thread from which i managed to get fixed in the current session.
Unfortunately, every time i reboot the system, the audio is only produced in back panel while front panel jack is activated only if i open a terminal window (either via launcher or shortcut
ctrl-alt-t). Soon after i have an open terminal, front audio jack/headphones start working and i have sound.
alsamixer parameters in a terminal before logging in an user, every setting appear to be normal and Headphone option is not muted.
Checked shortcuts keys in OS and there are no conflicts with media/sound related tasks.
I don't mind having to open and close a terminal to get my headphones working. The problem is that the PC is used by other people in my house that barely know what a terminal is and it would be a very uncomfortable workaround to explain.
This is such a very odd behavior that i got curious with so i am sharing it with anyone who might might tip the possible silly root cause.
I really appreciate any help you can provide.