1) originally we use speaker-test to test HDMI/DP/Legacy, failed on
Ubuntu 20.10. with 5.9 official kernel, works fine.

2) now we change to another method to test audio, works well.

Summary:
Seems test tools has some issue. 
5.9 official kernel support speaker-test, but in 5.8 (ubuntu 20.10), doesn't 
support speaker-test well.

new method to test audio:

here are our testing step, hope it will give you some hints.

Update
Kernel: 5.8.0-20-generic
Steps:
1. settings-> Sound -> Output Device
2. Click the Test, then click the audio symbol to check the sound.

CML-S/H, ICL-Y/U:
Legacy/DP/HDMI audio PASS

TGL-H:
Legacy/DP audio PASS

CML-U.V2, TGL-Y/U:
No legacy audio device in "aplay -l"

JSL:
Legacy audio PASS. (No graphic driver)

EHL:
aplay: device_list:274: no soundcards found...(No graphic driver)

** Changed in: intel
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1900792

Title:
  Audio doesn't work on Ubuntu 20.10

Status in intel:
  Won't Fix
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Description:

  This happens on almost of Intel client platforms(ICL, TGL, CML, CFL,
  JSL...). This is a regression issue happen. Ubuntu 20.04 doesn't have
  this problem.

  We ever try legacy audio doesn't work. The only working audio is audio
  output from Thunderbolt docking.

  DP/HDMI audio is under checking

  Target Release: 20.10

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