Comment 15 for bug 1906741

Same issue here. Garbled noises are being heard on top of my music (playing in the background via Rhythmbox) after starting Firefox and visiting some random website.

My desktop is an AMD Ryzen on a Gigabyte X570 mobo with an nVidia GeForce GTX 1060 3GB GPU. Like others noted, the noises seem stop for a while when I change the Output Device from "Line Out - Starship/Matisse" to "HDMI / DisplayPort X - GP106 High Definition Audio Controller". But after some minutes playback (or perhaps visiting some other page with firefox?), the garbled noises appear again... Also, like others, the noises disappear if I close Firefox...

uname -a
Linux ryzen 5.8.0-59-generic #66~20.04.1-Ubuntu SMP Thu Jun 17 11:14:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

sudo dmidecode -t 2
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.2.0 are not
# fully supported by this version of dmidecode.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
 Manufacturer: Gigabyte Technology Co., Ltd.
 Product Name: X570 GAMING X
 Version: Default string
 Serial Number: Default string
 Asset Tag: Default string
 Features:
  Board is a hosting board
  Board is replaceable
 Location In Chassis: Default string
 Chassis Handle: 0x0003
 Type: Motherboard
 Contained Object Handles: 0

sudo lshw -C sound
[sudo] password for dimitris:
  *-multimedia
       description: Audio device
       product: GP106 High Definition Audio Controller
       vendor: NVIDIA Corporation
       physical id: 0.1
       bus info: pci@0000:08:00.1
       version: a1
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:127 memory:fc080000-fc083fff
  *-usb:0
       description: Video
       product: Webcam C270
       vendor: Logitech, Inc.
       physical id: 3
       bus info: usb@5:3
       version: 0.12
       serial: 212F66E0
       capabilities: usb-2.00
       configuration: driver=snd-usb-audio maxpower=500mA speed=480Mbit/s
  *-multimedia
       description: Audio device
       product: Starship/Matisse HD Audio Controller
       vendor: Advanced Micro Devices, Inc. [AMD]
       physical id: 0.4
       bus info: pci@0000:0a:00.4
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress msi bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:129 memory:fc900000-fc907fff

lspci | grep Audio
08:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio Controller (rev a1)
0a:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller

dpkg -l | grep firefox
ii firefox 89.0.1+build1-0ubuntu0.20.04.1 amd64 Safe and easy web browser from Mozilla