[GA-78LMT-USB3 6.0, ATI RS690/780 HDMI, Digital Out, HDMI] No sound at all

[sepukkuhero]

The HDMI audio on the onboard ATI RADEON 3000 (RS780 driver, GA78LMT motherboard) does not work without tweaks in GRUB.

Expected behavior: sound working over HDMI.

Real behavior: no sound at all.

Solution: I installed "GRUB Customizer" and put the following command in the kernel parameter (which I found after a lot of research): "quiet splash radeon.audio = 1"

This needs to be resolved urgently, it can alienate novice users.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: poe 1860 F.... pulseaudio
 /dev/snd/pcmC2D0p: poe 1860 F...m pulseaudio
 /dev/snd/controlC0: poe 1860 F.... pulseaudio
 /dev/snd/controlC1: poe 1860 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 25 00:39:10 2021
InstallationDate: Installed on 2021-03-04 (51 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
Symptom_Card: RS780 HDMI Audio [Radeon 3000/3100 / HD 3200/3300] - HDA ATI HDMI
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: poe 1860 F.... pulseaudio
 /dev/snd/pcmC2D0p: poe 1860 F...m pulseaudio
 /dev/snd/controlC0: poe 1860 F.... pulseaudio
 /dev/snd/controlC1: poe 1860 F.... pulseaudio
Symptom_Jack: Digital Out, HDMI
Symptom_Type: No sound at all
Title: [GA-78LMT-USB3 6.0, ATI RS690/780 HDMI, Digital Out, HDMI] No sound at all
UpgradeStatus: Upgraded to focal on 2021-03-25 (30 days ago)
dmi.bios.date: 11/25/2014
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F2
dmi.board.name: GA-78LMT-USB3 6.0
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: SEx
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd11/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-USB36.0:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-USB36.0:rvrSEx:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-78LMT-USB3 6.0
dmi.sys.vendor: Gigabyte Technology Co., Ltd.