[SRU][I/raspi][PATCH 0/1] HDMI audio no longer working on Pi4 after 5.13.0-1011 (LP: #1957198)

[Juerg Haefliger]

[ 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
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.

Phil Elwell (1):
  ARM: dts: bcm2835_audio missing firmware reference

 arch/arm/boot/dts/bcm270x-rpi.dtsi | 1 +
 1 file changed, 1 insertion(+)

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2.30.2