The following steps will enable sound on the internal speakers for the HP dv4-1225dx

sudo gedit /etc/modprobe.d/alsa-base

Add the following lines:

alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=dell-m4-1

perform sudo reboot after saving your changes


Thank you, NaplesBill, for your posting on this fix!