https://wiki.ubuntu.com/Audio/AlsaInfo
if your desktop does not have any internal speaker
you need to fix up the pin default of node 0x1a to [N/A] instead of [Fixed] by early patching
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=blob_plain;f=Documentation/sound/alsa/HD-Audio.txt;hb=HEAD
https:/ /wiki.ubuntu. com/Audio/ AlsaInfo
if your desktop does not have any internal speaker
you need to fix up the pin default of node 0x1a to [N/A] instead of [Fixed] by early patching
http:// git.kernel. org/?p= linux/kernel/ git/tiwai/ sound.git; a=blob_ plain;f= Documentation/ sound/alsa/ HD-Audio. txt;hb= HEAD