if the output of cat /proc/asound/card0/codec#* | grep Codec on your machine is this :
Codec: Realtek ALC269
Codec: Intel G45 DEVIBX
(Solution Courtesy @nsisodiya)
following modules are present.
ALC269 ====== basic Basic preset quanta Quanta FL1 eeepc-p703 ASUS Eeepc P703 P900A eeepc-p901 ASUS Eeepc P901 S101 fujitsu FSC Amilo lifebook Fujitsu Lifebook S6420 auto auto-config reading BIOS (default)
It do not list acer laptop but auto should word which is default and not working
so
try something like
modprobe -r snd-hda-intel
modprobe snd-hda-intel model=basic
Or model=eeepc-p901 etc