B12A — audio audit (read-only, desk only), 2026-10-04

B11 LED topic closed by the operator: the 15-LED array under the display frame (BOT side, logs/b11/b11c/B11C2-annotated-bot.jpg) is the display backlight.

Stock

DT dtb_01: internal codec. Analog part = PM8916 "Tombak" msm8x16_wcd_codec@f000/@f100 (qcom,wcd-spmi): speaker class-D IRQs (spk_cnp/clip/ocp), headset detect/MBHC (ins_rem_det, but_press/rel_det, mbhc_int), earpiece/HPH OCP. Supplies (rails inferred from voltages): VDDA_CP/VDD_PX 1.8–2.2 V (≈S4), VDDA_H/VDD_PA 1.8 V (≈L5), micbias 3.075 V (≈L13). Card sound qcom,msm8x16-audio-codec, model msm8x16-snd-card-mtp (generic MTP), ext-pa "primary", US/Euro switch GPIO113, cdc-pdm GPIO63–68.
Android: the card probed (card0 + "Button Jack"/"Headset Jack" inputs), audiod/mediaserver ran. /system/etc mixer_paths.xml = stock Qualcomm 8916 MTP (speaker = SPK DAC, handset = EAR PA, headphones = HPHL/R, handset-mic ADC1, headset-mic ADC2); mixer_paths_mtp.xml differs only in speaker-mic → ADC3. audio_policy.conf: attached EARPIECE|SPEAKER, BUILTIN_MIC|BACK_MIC. All of it is the unmodified reference config → no evidence the board has any transducer.
No Aurora-specific audio code or config found.

Photos (logs/b11/b11c/photos, 3 shots)

No speaker, earpiece, microphone, 3.5 mm jack, or spring contacts labelled SPK/MIC visible. The edge clips at the bottom of TOP = antenna feeds (PRX, next to the RF test connector). Top-left empty pad field + "DIV" connector = unpopulated diversity RX chain, not audio. BOT test pads: DP, DM, VBUS, VBAT, … (USB/battery).
Under the shield cans: not visible. The PM8916 codec pins (SPK_P/N, EAR, HPH, MIC_IN1–3) may be routed to nothing.

Current Linux

7.2.7-aurora-b10b5: CONFIG_SOUND not set. QCOM_APR=y, RPMSG SMD=y.
Upstream path without the DSP: msm8916.dtsi &lpass (apq8016-lpass-cpu) + &lpass_codec (msm8916-wcd-digital) + &pm8916_codec (analog) + &sound (qcom,apq8016-sbc-sndcard). msm8916-pm8916.dtsi already sets codec supplies L5/L5/L13. Many upstream 8916 phones use exactly this.

Risks for any later enablement (needs GO)

micbias on L13 = the USB PHY 3.075 V rail (NCM). The codec must not change the L13 voltage; verify regulator constraints before any boot.
GPIO63–68 (cdc-pdm) and 113 stay codec-only. The rest of the B11 DO-NOT-TOUCH list stays as it was.
Without a transducer a test proves only that the driver probes, the DAPM paths and the PMIC registers. No sound can be heard.

Verdict

Codec silicon = present (PM8916 + MSM8916 digital codec, always). Audio HW on the board = not found (no speaker, mic, or jack visible). Next step depends on the operator: are there speaker/mic openings in the case, or SPK/MIC pads under the display or near the cans?

Closure (2026-10-04)

Operator: the case has no speaker and no microphone. B12 audio CLOSED — not applicable: codec silicon present, no transducers. No enablement planned; CONFIG_SOUND stays off. If ever needed: upstream apq8016-sbc path, mind micbias ≈ L13 shared with USB PHY.

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