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Diffstat (limited to 'docs/design/2026-07-10-audio-failure-taxonomy.org')
| -rw-r--r-- | docs/design/2026-07-10-audio-failure-taxonomy.org | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/design/2026-07-10-audio-failure-taxonomy.org b/docs/design/2026-07-10-audio-failure-taxonomy.org index efb6e0a..bea0f65 100644 --- a/docs/design/2026-07-10-audio-failure-taxonomy.org +++ b/docs/design/2026-07-10-audio-failure-taxonomy.org @@ -29,6 +29,7 @@ Built 2026-07-10 from a parallel research sweep across eight layers (kernel/driv - AMD ACP6x DMIC needs a DMI quirk, not firmware (both). Ryzen laptop internal array mic absent or silent; sof-firmware changes nothing. The acp6x mic array needs the laptop's DMI entry in the =SND_SOC_AMD_YC_MACH= quirk table. Fix: newer kernel with the board's DMI quirk, or add the entry and rebuild. [[https://bbs.archlinux.org/viewtopic.php?id=311093][arch 311093]] - Missing NHLT ACPI table in firmware (both). No DMIC; dmesg shows "NHLT table not found". The platform firmware omits the NHLT table, so SOF can't discover the digital-mic count. Fix: flash firmware that supplies NHLT, or override the dmic count via SOF modprobe params. [[https://github.com/MrChromebox/firmware/issues/920][mrchromebox 920]] - Brand-new AMD ACP7.0 (Strix Halo) has no mic driver/UCM yet (both). Internal DMIC non-functional on very recent AMD hardware. The kernel ACP7.0 SOF driver and UCM profile weren't upstreamed yet. Fix: wait for the kernel + alsa-ucm-conf that add ACP7.0 support. [[https://github.com/alsa-project/alsa-ucm-conf/issues/745][ucm-conf 745]] +- AMD ACP PDM digital mic emits a full-scale rail, Framework 13 on Ryzen AI 300 (yes). Internal mic dead in every app; a raw capture of =hw:acppdmmach= reads rms 0.99999 and peak 1.0 on every sample, which is a rail, not silence and not the privacy switch. A still-open kernel bug in the ACP PDM path on Strix Point and Krackan Point (no AMD SOF firmware exists for the platform); with UCM on, alsa-ucm-conf links the broken =acp-pdm-mach= card into the ALC285 codec card, so that DMIC is the only internal mic PipeWire offers. Fix: =alsa.use-ucm = false= plus a =monitor.alsa.rules= entry disabling the =acp-pdm-mach= card, shipped by archsetup as =/etc/wireplumber/wireplumber.conf.d/50-disable-ucm.conf= on this board; the ALC285 falls back to analog-stereo, whose Internal Microphone pin carries real audio (drop the source volume, the analog path stacks +30 dB capture on +30 dB boost). Re-test the DMIC after kernel updates; once upstream fixes it, remove the file and UCM can go back on. Found on velox 2026-10-06. [[https://community.frame.work/t/81866][framework 81866]], [[https://community.frame.work/t/75748][framework 75748]] ** ALSA (profiles, UCM, mixer, pins, state) @@ -180,6 +181,7 @@ Probe: kernel-vs-graph (the mic-unrecognized rule) plus WirePlumber liveness. Th - ACP vs UCM detection mismatch :: AUTO — set =use-acp=/=use-ucm= plus restart wireplumber. - Missing UCM capture profile :: AUTO — fall back to ACP; GUIDE the UCM patch/install. +- AMD ACP PDM rail (Framework 13 on Ryzen AI 300) :: PRIV — install the =50-disable-ucm.conf= drop-in (UCM off plus the =acp-pdm-mach= card disabled) under =/etc= and restart wireplumber; archsetup ships it on this board. The two use-ucm remedies above and the drop-in removals in this cluster must treat that installed file as the fix, not as an offending config: flipping =use-ucm= back on, or deleting the file, puts the railing DMIC back as the only internal mic. The doctor should recognise the rail itself (a raw =hw:acppdmmach= capture at rms 0.99999) before it touches UCM on this hardware. - WirePlumber fails to start on old config :: AUTO — remove the user drop-in plus restart (PRIV if the file is under =/etc=). - pipewire-pulse dead or wrong socket :: AUTO — restart the user services; check XDG_RUNTIME_DIR. - Broken ~/.config/wireplumber override :: AUTO — remove/repair the drop-in plus restart. |