POWER-FINAL-32 — deep idle during screen-off playback

Status: SUPERSEDED, NEVER FLASHED ALONE; PLAYBACK TEST OWED (2026-10-14; contained in 33–34, installed as part of 33). Package out/y2linux-platform-v1-power-final-candidate-32/ (fallback = 31), receipts out/deep-sleep-final/build32-receipts/. BOOTIMG 5f1766ca727ffee2824aab2f2bfee5f09d06bbe68dcc27146887338bc591a131, Y2ROOT f9ca5bbc5c7400e9d7d45708efcf70d8f58c9afe79ebfe4ded8724763d558938. Identity: build Y2LINUX-PLATFORM-V1-POWER-FINAL-32, kernel 6.18.56-y2linux-platform-v1-power-final-32, root 2026.08-platform-v1.62, release 1.0.0-platform-v1-power-final-candidate.32; Linux 4ded0fe, Reborn 0892bf2. Contains 27–31.

Why

Awake idle on 29 (ledger F34–F38): only WFI is ever used awake. Screen-off playback never deep-idled because Y2's deep-idle clock rule also required the INFRA audio clock (bit 5) off; stock dpidle does not (INFRA mask 0xa080, AUDIO group unchecked, AUDINTBUS moved to 26 MHz around the WFI, which Y2 already mirrors). Enabled-but-idle Bluetooth blocks every deep idle (BTIF/AP_DMA clocks, CONN domain); that is a separate, larger change (STP PSM).

What 32 changes

clocks.c: deep_idle_audio (kernel default N = 31) drops bit 5 from the INFRA deep-idle mask; deep_audio_entries counts deep-idle clock handovers made with the AFE clock on. power_features arms the switch; sleep rows record it.

Tests

test_cpu_fix03 (audio clock blocks when off, admitted and counted when on, stock-mask INFRA clocks still block), test_cpu_c3_uart/test_cpu_fix02 (shared mask helper), test_power_final_27 (switch armed/overridable). Kernel warnings unchanged (47). validate PASS, ELF 354, installed ARM, privacy, inventory, container suite 713 OK.

Owner test

Wired headphones, Bluetooth off, screen off, ≈30 min playback. Before/after: SPM dormant_entries / dormant_residency_us, cpuidle SLIDLE/DORMANT usage/time, deep_audio_entries, Reborn audio_xruns, listening for clicks. Disable with {"deep_idle_audio": false} in /data/system/platform/power-features.json.