Bug#976717: Microphone is working in Debian 10 and not working in Debian 11, MSI GX660 laptop

Package: linux-image-amd64

Version: 5.9.0-4-amd64

On my laptop (MSI GX660, sound chipset Realtec ALC888) microphone is working in Debian 10 and not working in Debian 11. Microphone volume slider in pavucontrol is greyed out. There are logs produced by alsa-info util from each of the systems:

http://alsa-project.org/db/?f=628757e7d1ea54e4359ed0c404e2a01d2c654c9e - from Debian 10

http://alsa-project.org/db/?f=27a0f92cf64889154cf3168d6a9a5fbad16848de - from Debian 11

The relevant difference seems to be in this section:

In Debian 10:

!!PCI Soundcards installed in the system
!!--------------------------------------

00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio [8086:3b56] (rev 06)
Subsystem: Micro-Star International Co., Ltd. [MSI] 5 Series/3400 Series Chipset High Definition Audio [1462:1080]
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Juniper HDMI Audio [Radeon HD 5700 Series] [1002:aa58]
Subsystem: Micro-Star International Co., Ltd. [MSI] Juniper HDMI Audio [Radeon HD 5700 Series] [1462:aa58]

In Debian 11:

!!PCI Soundcards installed in the system
!!--------------------------------------

00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio [8086:3b56] (rev 06)
DeviceName: Onboard Audio
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Juniper HDMI Audio [Radeon HD 5700 Series] [1002:aa58]
Subsystem: Micro-Star International Co., Ltd. [MSI] Juniper HDMI Audio [Radeon HD 5700 Series] [1462:aa58]

Probably a bug in kernel driver. Please fix it.