Public bug reported:

[Impact]
Bogus HDMI audio can be selected as output, without any HDMI monitor
connected.

[Fix]
Consider 0 SAD as invalid ELD - no SAD means no audio.

[Test]
With the patch applied, no bogus HDMI audio can be found in GNOME's
setting app.

[Where problems could occur]
Basically none. No SAD means no PCM - so it has never worked before.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Confirmed

** Affects: linux-oem-5.14 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Won't Fix

** Affects: linux-oem-5.14 (Ubuntu Focal)
     Importance: Low
         Status: Confirmed


** Tags: oem-priority originate-from-1950580 somerville

** Also affects: linux-oem-5.14 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.14 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.14 (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu Focal)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux-oem-5.14 (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux-oem-5.14 (Ubuntu Focal)
   Importance: Undecided => Low

** Tags added: oem-priority originate-from-1950580 somerville

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https://bugs.launchpad.net/bugs/1953208

Title:
  Fix bogus HDMI audio interface

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