No audio device shown in sound panel.

** Attachment added: "No audio device shown in sound panel."
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1625364/+attachment/4743909/+files/no-device-in-sound-panel.png

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https://bugs.launchpad.net/bugs/1625364

Title:
  No audio on Ubuntu 16.04

Status in pulseaudio package in Ubuntu:
  New

Bug description:
  There is no audio in Chrome, VLC displays this error message:

  "Audio output failed:
  "pulse" sound device can not be used:
  Connection refused."

  After "pulseaudio -k" the sound returns temporarily (then it's dead again 
after some minutes).
  Pulseaudio log attached.

  -------------------------------------------------

  lsb_release -rd
  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04

  uname -a
  Linux 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

  lspci
  00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor 
DRAM Controller (rev 06)
  00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor 
PCI Express x16 Controller (rev 06)
  00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor 
Integrated Graphics Controller (rev 06)
  00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core 
Processor HD Audio Controller (rev 06)
  00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series 
Chipset Family MEI Controller #1 (rev 04)
  00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #2 (rev 04)
  00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High 
Definition Audio Controller (rev 04)
  00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #1 (rev d4)
  00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #3 (rev d4)
  00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #4 (rev d4)
  00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #5 (rev d4)
  00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #1 (rev 04)
  00:1f.0 ISA bridge: Intel Corporation HM87 Express LPC Controller (rev 04)
  00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset 
Family 6-port SATA Controller 1 [AHCI mode] (rev 04)
  00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus 
Controller (rev 04)
  01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)
  03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI 
Express Card Reader (rev 01)
  04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
  05:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)

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