Unthrottled NotificationManagerService:post wakelock loop (2,116+ wakeups) prevents device deep sleep / Doze

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During an extended battery trace (21 hours on battery, 18 hours screen-off), com.sameerasw.airsync accumulated 2,116 partial wakelocks under NotificationManagerService:post:com.sameerasw.airsync.
​A detailed timestamp analysis of the batterystats transaction history reveals that AirSync calls NotificationManager.notify() in sustained, 1-second consecutive bursts while the screen is off. This repeatedly resets DeviceIdleController and forces the Linux kernel to abort hardware suspend.
​Batterystats Log Extracts:

Wake lock NotificationManagerService:post:com.sameerasw.airsync: 7m 55s 667ms partial (2116 times) max=492 actual=523992 realtime
Foreground services: 21h 18m 3s 734ms realtime (running)

```text
Apk com.sameerasw.airsync:
  Service com.sameerasw.airsync.service.MacMediaPlayerService:
    Starts: 61, launches: 61
  Service com.sameerasw.airsync.service.AirSyncService:
    Created for: 17h 29m 9s uptime
  Service com.sameerasw.airsync.service.WakeupService:
    Created for: 17h 29m 9s uptime
```[span_40](start_span)[span_40](end_span)

**Consecutive 1-Second Post Frequency (Sample from `batterystats -b`):**

```text
09-23 09:32:41.518 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:32:42.436 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:32:43.753 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:32:44.436 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:32:45.041 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync" wake_reason="Abort: ... userspace-abort"
09-23 09:32:46.791 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:32:47.671 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"

09-23 09:34:07.100 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:34:07.825 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:34:09.594 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:34:10.327 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:34:11.088 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:34:11.900 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"

09-23 09:48:02.571 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:03.460 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:04.801 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:05.726 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:06.543 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:07.500 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
09-23 09:48:08.886 +wake_lock=u0a530:"NotificationManagerService:post:com.sameerasw.airsync"
```[span_41](start_span)[span_41](end_span)[span_42](start_span)[span_42](end_span)

**Observed Impact:**
* Because each notification post invokes system server wakeups[span_43](start_span)[span_43](end_span)[span_44](start_span)[span_44](end_span), the kernel fails to enter suspend (`userspace-abort`, `Abort: Device alarmtimer.5.auto failed to suspend: error -16`)[span_45](start_span)[span_45](end_span)[span_46](start_span)[span_46](end_span).
* Over 14 hours of screen-off uptime out of 18 hours[span_47](start_span)[span_47](end_span), causing severe idle battery drain.

**Root Cause Hypothesis & Recommendations:**
1. **Media Progress Ticker:** The 1-second cadence strongly suggests `MacMediaPlayerService` is updating media playback position/elapsed time inside a notification continuously[span_48](start_span)[span_48](end_span)[span_49](start_span)[span_49](end_span). On Android, media progress should rely on `MediaSessionCompat` / `PlaybackStateCompat` timestamps so the OS interpolates time on the client side, rather than pushing `.notify()` updates every second.
2. **Diff State Payloads:** Avoid calling `NotificationManagerCompat.notify()` unless the visible payload (title, artist, connection state, or battery level) has actually changed.
3. **Screen-Off Throttling:** When the display is off (`Intent.ACTION_SCREEN_OFF`), suspend continuous notification updates entirely or throttle them to coarse intervals.

***

---

### Immediate Workaround for Your Phone

While waiting for an app update, stop AirSync from keeping your phone awake overnight:

```bash
cmd appops set com.sameerasw.airsync RUN_ANY_IN_BACKGROUND ignore

Verification: cmd appops get com.sameerasw.airsync RUN_ANY_IN_BACKGROUND (returns ignore).
What it does: Freezes AirSync when the phone is locked so it cannot spin background notification loops.  
To revert later: cmd appops set com.sameerasw.airsync RUN_ANY_IN_BACKGROUND default.

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dumpsysbatterystats_grep-B1-A2_NotificationManagerService_post_com.sameerasw.airsync_.txt
dumpsysbatterystats_-data-local-tmp-bs.txt&&grep-C2_com.sameerasw.airsync_-data-local-tmp-bs.txt_-sdcard-Download-airsync_repo...t&&grep-A35_UIDu0a530__-data-local-tmp-bs.txt__-sdcard-Download-airsync_report.txt&&cat-sdcard-Download-airsync_report.txt.txt