Add DMI quirk table entry for the MDC HerbagEX_MDU board found in
Acer Extensa 215-23 laptops (AMD Ryzen 5 7520U, Rembrandt platform).
Without this entry, the ACP6x PDM machine driver silently fails to
probe (falls back to ACPI matching which does not succeed on this
board), and the internal digital microphone never registers a sound
card, even though the hardware and firmware fully support it (the
microphone works correctly under Windows on the same machine).
Confirmed working after adding this quirk: /proc/asound/cards shows
the new "acp6x" card, and arecord -l exposes a DMIC capture device
that records audio correctly. Verified via pw-record + sox stat:
RMS amplitude ~0.06-0.10 during live speech, versus ~0.0003-0.003
noise floor recorded without the fix (i.e. effectively silence).
DMI info from the affected machine:
# dmidecode -t baseboard
Manufacturer: MDC
Product Name: HerbagEX_MDU
Version: V1.20
Signed-off-by: Sabirov Mikhail it.96@yandex.ru
---
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 69c68d8e7a6b..1760b5d42460 100644
--- a/sound/soc/amd/yc/acp6x-mach.c
+++ b/sound/soc/amd/yc/acp6x-mach.c
@@ -637,6 +637,13 @@ static const struct dmi_system_id yc_acp_quirk_table[] = {
DMI_MATCH(DMI_BOARD_NAME, "Herbag_MDU"),
}
},
+ {
+ .driver_data = &acp6x_card,
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "MDC"),
+ DMI_MATCH(DMI_BOARD_NAME, "HerbagEX_MDU"),
+ }
+ },
{
.driver_data = &acp6x_card,
.matches = {
--
2.44.0