** Description changed:

+ [ Impact ]
+ 
  Confirming reports made in the UbuntuMATE forums.
  
  HDMI audio no longer shows as available on kernels beginning with
  5.13.0-1011
  
  After reverting to kernel 5.13.0-1008 HDMI audio is available.
  
  Pi4 4GB
  
  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: linux-image-5.13.0-1008-raspi 5.13.0-1008.9
  ProcVersionSignature: Ubuntu 5.13.0-1008.9-raspi 5.13.14
  Uname: Linux 5.13.0-1008-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: arm64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Wed Jan 12 10:56:22 2022
  ImageMediaBuild: 20201028
  ProcEnviron:
-  LANGUAGE=en_US
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_US
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: linux-raspi
  UpgradeStatus: Upgraded to impish on 2021-09-26 (107 days ago)
+ 
+ [ Test Case ]
+ 
+ Boot Ubuntu MATE *or* Ubuntu Desktop with fkms enabled (instead of kms).
+ 
+ $ cat $ cat /proc/asound/cards
+  0 [Headphones     ]: bcm2835_headpho - bcm2835 Headphones
+                       bcm2835 Headphones
+ 
+ Correct output should be:
+ $ cat /proc/asound/cards
+  0 [b1             ]: bcm2835_hdmi - bcm2835 HDMI 1
+                       bcm2835 HDMI 1
+  1 [Headphones     ]: bcm2835_headpho - bcm2835 Headphones
+                       bcm2835 Headphones
+ 
+ [ Fix ]
+ 
+ Cherry pick missing commit ("ARM: dts: bcm2835_audio missing firmware
+ reference") from raspberrypi linux.
+ 
+ [ Where Problems Could Occur ]
+ 
+ It's a change to the audio portion of the bcm270x DTB so problems will
+ likely be audio related, like no output device at all.

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https://bugs.launchpad.net/bugs/1957198

Title:
  HDMI audio no longer working on Pi4  after 5.13.0-1011

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