The sound/audio worked right out of the box on a fresh install but after some updates it stopped working. A lot of people seem to be having trouble getting their audio working on the Gateway MX6448. I guess I must have been lucky seeing as I ran across a very simple fix in a forum right away after my sound stopped working.
Add the following two lines to the end of this file.
/etc/modprobe.d/alsa-base
alias snd-card-0 snd-hda-intel
options snd-hda-intel model=test enable-msi=1 probe-mask=1
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