I have the same Motherboard, i was able to fix the issue by added the
two lines to the bottom of the /etc/modprobe.d/alsa-base.conf file.
alias snd-card-0 snd-hda-intel
options snd-hda-intel model=auto
$ sudo dmidecode -t 1
# dmidecode 2.9
SMBIOS 2.4 present.
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: GA-MA78LMT-S2
Version:
Serial Number:
UUID: 31433646-3635-3536-3146-3445FFFFFFFF
Wake-up Type: Power Switch
SKU Number:
Family:
$ amixer -c 0 info
Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
Mixer name : 'Realtek ALC887'
Components : 'HDA:10ec0887,1458a002,00100302'
Controls : 27
Simple ctrls : 16
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Soundcard not detected
https://bugs.launchpad.net/bugs/674276
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