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All of my background apps get killed when I turn off the screen. This is particularly annoying for my most-used messaging app, WhatsApp.

I've looked at the obvious "Battery Optimization" option: battery optimization

Based on advice found elsewhere, I've checked that the background process limit in developer options is the default (I've never changed this AFAIK): developer options

And yet, it gets killed in the same manner as battery optimization would. If I look at running background processes:

before poweroff

When I then press the power button, and power it back on after < 10s, the list is the same. But if I wait longer than that:

after poweroff

...whatsapp has disappeared.

This happens for all apps I install that have some sort of useful background feature - the Battery Optimization setting doesn't seem to do its job anymore.

What else can I try to diagnose this?

NB0: Android 7.0 on DOOGEE S60

NB1: This just started happening some time ago, i.e., it did work propertly when I got the phone.

NB2: I know how to use adb

NB3: I'm also fond of trying new apps and have ~400 apps installed. Ideally, I don't uninstall/disable all of them 1-by-1 to see which one is the culprit...

  • Install Addons Detector or any other similar app and filter to see which apps have permission KILL_BACKGROUND_PROCESSES granted. – Irfan Latif Jul 12 at 4:32
  • @IrfanLatif hmm only 2 apps show up. 1 is MX Player (presumably because it can make itself the exclusive media player?), the other is Tasker (which I haven't used in ages). Both don't seem likely candidates...Uninstalling them, trying again. – Rody Oldenhuis Jul 12 at 4:43
  • @IrfanLatif nope, no effect. Whatsapp is still killed. If it makes any difference, most of my widgets (clocks etc.) also stop updating after reboot + screen off...same thing I guess – Rody Oldenhuis Jul 12 at 5:04
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    Use this method to track kill syscall. Requires root. – Irfan Latif Jul 12 at 5:31
  • ...hmm. It would appear the DOOGEE S60 is not easily rooted. Not without significant effort and wiping the entire phone, that is. Any other suggestions? – Rody Oldenhuis Jul 12 at 6:12

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