remove model=generic from /etc/modprobe.d/alsa-base.conf

!!Modprobe options (Sound related)
!!--------------------------------

snd_hda_intel: model=generic


High Definition Audio with Realtek ALC221 codec (all ports are stereo)
Microphone/Headphone front ports (standard)
Line-out and Line-In rear ports (standard)
Multi-streaming capable (standard)     <------ add hint  indep_hp =true
Internal Speaker (standard)
HP Thin USB Powered Speakers (optional)

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt


autoconfig: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
   speaker_outs=1 (0x17/0x0/0x0/0x0/0x0)
   hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
   mono: mono_out=0x0
   inputs:
     Mic=0x1a
     Line=0x19

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https://bugs.launchpad.net/bugs/1251127

Title:
  [HP Compaq Pro 4300 SFF PC, Realtek ID 221, Green Line Out, Rear]
  Pulseaudio fails to detect card

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