The Acer Extensa 215-23 has an internal digital microphone connected to
the AMD ACP6x audio coprocessor, but its BIOS does not expose the DMIC
through ACPI (_WOV / AcpDmicConnected). acp6x_probe() therefore falls
back to the DMI quirk table, finds no match and returns -ENODEV, so no
DMIC sound card is created and the internal microphone is unusable.

Add a DMI entry for this model.

Assisted-by: LLM
Signed-off-by: Andrey Starostin <ndrstrstn@gmail.com>
---
Tested on the affected machine, running 7.2.3 with this change built as
an out-of-tree module. Before: writing to the driver's "bind" attribute
for acp_yc_mach.0 fails with -ENODEV and no DMIC card exists. After:
"acp_yc_mach acp_yc_mach.0: Enabling ACP DMIC support via DMI", a card
"acp6x" with "DMIC capture dmic-hifi-0" appears, and arecord/PipeWire
capture live audio from the internal microphone. Speaker output via the
HDA codec is unaffected.

DMI strings of the machine:
  sys_vendor:      Acer
  product_name:    Extensa 215-23
  product_version: V1.18
  board_vendor:    MDC
  board_name:      HerbagEX_MDU
  bios_version:    V1.18 (06/18/2024)

Per Documentation/process/generated-content.rst: the diagnosis (HDA pin
defaults, acp6x_probe() failure path) and this patch were produced with
the help of an AI coding assistant (Claude); the change was reviewed and
tested by me on the hardware.

 sound/soc/amd/yc/acp6x-mach.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/amd/yc/acp6x-mach.c b/sound/soc/amd/yc/acp6x-mach.c
index 385fede6d77f..246e18c66272 100644
--- a/sound/soc/amd/yc/acp6x-mach.c
+++ b/sound/soc/amd/yc/acp6x-mach.c
@@ -52,6 +52,13 @@ static const struct dmi_system_id yc_acp_quirk_table[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire AG14-22P"),
 		}
 	},
+	{
+		.driver_data = &acp6x_card,
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 215-23"),
+		}
+	},
 	{
 		.driver_data = &acp6x_card,
 		.matches = {
-- 
2.55.0

On Mon, 14 Sep 2026 16:16:10 +0300, Andrey Starostin wrote:
> ASoC: amd: yc: Add DMI entry for Acer Extensa 215-23

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-7.3

Thanks!

[1/1] ASoC: amd: yc: Add DMI entry for Acer Extensa 215-23
      https://git.kernel.org/broonie/sound/c/581289734a6d

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark