Update: still affects 21.04 and the above Reddit solution no longer
works for me

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https://bugs.launchpad.net/bugs/1895422

Title:
  Sound card not detected on Dell Latitude 9510 (Realtek ALC711)

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  I am running Ubuntu 20.04.01 LTS, kernel version 5.6.0-1027-oem
  (checked via uname -r).

  
  I believe my sound card is not being detected by Ubuntu.  I checked the 
serial number and via BIOS (which I've upgraded to the latest version) 
according to the specs 
(https://topics-cdn.dell.com/pdf/latitude-15-9510-2-in-1-laptop_owners-manual5_en-us.pdf)
 the sound controller/speaker should be Realtek ALC711-CG / Realtek ALC1309D.

  However, when I run lspci only the following device appears:
  00:1f.3 Multimedia audio controller [0401]: Intel Corporation Device 
[8086:02c8]

  In alsamixer, only the HDMI port appears.

  alsa-info output: http://alsa-
  project.org/db/?f=f2b70f6eb1a237378bf563cacb6f192ce0a677c3

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