Public bug reported:
Laptop: MSI Thin A15 B7UCX REV:1.0
Board: MS-16RK
BIOS: E16RKAMS.10E (2025-06-20)
Distro: Linux Mint
Kernel: 7.0.0-31-generic
Internal microphone works on Windows. On Linux it does not capture
audio.
arecord -l shows only ALC256 Analog. No ACP/DMIC capture device.
PipeWire analog-input-mic port is "not available". Recording is silent.
AMD ACP is present:
Device-3: AMD ACP/ACP3X/ACP6x Audio Coprocessor
PCI 05:00.5 chip-ID 1022:15e2
driver: snd_pci_acp6x
Modules loaded but unused (refcount 0):
snd_soc_acp6x_mach
snd_acp6x_pdm_dma
snd_pci_acp6x
Expected: ACP digital mic registered via DMI quirk in
sound/soc/amd/yc/acp6x-mach.c
Related: kernel bugzilla 220833 (B7VF). A B7UC quirk patch exists
("Thin A15 B7UC") but this machine is "Thin A15 B7UCX" and still
has no ACP capture source.
Please add DMI_PRODUCT_NAME "Thin A15 B7UCX" to yc_acp_quirk_table.
Note: ubuntu-bug linux failed on Mint:
"This does not look like an official Linux package"
(linux-image-7.0.0-31-generic).
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "mic-bug-inxi.txt"
https://bugs.launchpad.net/bugs/2167333/+attachment/6000401/+files/mic-bug-inxi.txt
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https://bugs.launchpad.net/bugs/2167333
Title:
Internal microphone not detected on MSI Thin A15 B7UCX (missing ACP/YC
DMI quirk)
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