[Bug 2139264] Re: Internal microphone not detected on ASUS ExpertBook BM1503CDA (AMD Rembrandt)

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https://bugs.launchpad.net/bugs/2139264

Title:
Internal microphone not detected on ASUS ExpertBook BM1503CDA (AMD
Rembrandt)

Status in linux package in Ubuntu:
New
Status in linux source package in Noble:
New

Bug description:
I am reporting an issue where the internal digital microphone (DMIC)
is not recognized on my ASUS ExpertBook BM1503CDA.

Hardware Environment:
- Laptop: ASUS ExpertBook BM1503CDA
- CPU: AMD Rembrandt (Ryzen 7000 series)
- Audio: AMD ACP 6x Audio Coprocessor [1022:15e2] (rev 60)
- Codec: Realtek ALC256
- Kernel: 6.14.0-37-generic (Ubuntu 24.04)

Problem Description:
The system only detects the "Headset Mic" (0x19), but the internal digital microphone is completely missing from the available input devices.

I have already tried the following without success:
1. Installing 'firmware-sof-signed' and 'alsa-ucm-conf'.
2. Setting 'options snd-intel-dspcfg dsp_driver=3'.
3. The 'lsmod' output confirms that 'snd_sof_amd_rembrandt' is loaded, but the microphone remains unavailable.

It seems my specific Subsystem ID (0x00aa0100) is missing a quirk or
proper PDM initialization in the current kernel version.

ALSA Information Link:
Your ALSA information is located at http://alsa-project.org/db/?f=7020c96e27dc0c4bd3f152402becd235267bb12d
---
ProblemType: Bug
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: andrej 2330 F.... wireplumber
/dev/snd/controlC0: andrej 2330 F.... wireplumber
/dev/snd/seq: andrej 2323 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2025-11-03 (86 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1)
MachineType: ASUSTeK COMPUTER INC. ASUS EXPERTBOOK BM1503CDA
Package: linux (not installed)
ProcEnviron:
LANG=cs_CZ.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-37-generic root=UUID=c440e49f-5260-4f6d-943e-6a58c876cc2b ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 6.14.0-37.37~24.04.1-generic 6.14.11
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.14.0-37-generic N/A
linux-backports-modules-6.14.0-37-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.23
Tags: noble
Uname: Linux 6.14.0-37-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 04/17/2025
dmi.bios.release: 5.24
dmi.bios.vendor: ASUSTeK COMPUTER INC. (Licensed by AMI, LLC.)
dmi.bios.version: BM1503CDA.317
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: BM1503CDA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnASUSTeKCOMPUTERINC.(LicensedbyAMI,LLC.):bvrBM1503CDA.317:bd04/17/2025:br5.24:svnASUSTeKCOMPUTERINC.:pnASUSEXPERTBOOKBM1503CDA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnBM1503CDA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:
dmi.product.family: ASUS EXPERTBOOK
dmi.product.name: ASUS EXPERTBOOK BM1503CDA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

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