Solution 1:

I found the solution (!), create a new file /etc/modprobe.d/intel.conf

add the following options:

options snd-hda-intel single_cmd=1
options snd-hda-intel probe_mask=1

reboot....

Solution 2:

The solution works for Ubuntu 14.10 also! I have HP ProBook 470 G3, too.

Being new to linux, it took me some time to use the hint. This is the full set of commands; the first one creates, the second one edits the file.

sudo touch /etc/modprobe.d/intel.conf
sudo nano /etc/modprobe.d/intel.conf

Type the two options below in the editor, press ctrl+x to exit, type y to confirm and enter to confirm filename.

options snd-hda-intel single_cmd=1
options snd-hda-intel probe_mask=1

Then reboot.