drivers - Dell Precision 7510 Loses sound after upgrade from 14.04 (OEM) to 16.04 - Ask Ubuntu

so got dell precision 7510 yesterday, , proceeded upgrade 14.04 16.04 i'd rather on latest release. went fine except fact system not detect sound card anymore. if go system settings > sound, there empty box outputs should detected. lspci reveals @ least 2 devices should show up:

audio device: nvidia corporation device 0fbc (rev a1) audio device: intel corporation sunrise point-h hd audio (rev 31) 

i believe intel device 1 need working again.

under additional drivers, noticed missing before well, though open source drivers in use on system (except gpu).

i'd rather not go 14.04 if possible, , i'd not want stay on release (i'd rather machine last me more 3 years left of support). it's been while since i've used ubuntu i'd appreciate of go here. @ moment i'm running sound through h4n via usb, i'd rather not have long term.

edit: may affected bug machine using same chipset: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1616079

( first real shutdown (not reboot) if not done)
seems intel soundcard 2nd one.
select it, install , launch pavucontrol (pulseaudio volume),
go "output devices" tab,
click green button "set fallback" near intel soundcard
(in case, should in bottom)

as fails, in case problem solved recently, can try latest alsa driver ubuntu ( daily build snapshots, see here) :
paste , run successively 3 commands in terminal:
sudo add-apt-repository ppa:ubuntu-audio-dev/alsa-daily sudo apt-get update sudo apt-get install dkms oem-audio-hda-daily-dkms
reboot

as failed too, may alsa ok not pulseaudio:
check alsamixer:
run alsamixer in maximized terminal, use f6 select intel soundcard : see more faders "line out"? anyway, tweak volumes using left/right arrows scroll thru faders, up/down set each fader levels (set max test) , m key mute/unmute (unmute all)

edit: reset pulseaudio configuration: jackd sound server has sound working, , jackd use underlaying alsa layer, alsa ok problem comes pulseaudio (which sound server using underlaying alsa jackd do) . resetting pulseaudio config current user can done running in terminal:

mv ~/.config/pulse ~/.config/pulseold
then
killall pulseaudio
pulseaudio restart creating new config.
check if have tweak pulseaudio config in /etc/pulse

edit2 : restore alsa volume @ startup :
sudo alsactl store , sudo alsactl store 1 when volumes ok . 2nd command may return error if have no second soundcard .
alsactl restore , alsactl restore 1 done @ startup.