Idle battery drain -prevent sleep by Assistantdelay

[efitko]

Hi everyone,

I've been dealing with idle battery drain for quite some time. Overnight, I can lose up to 40% of battery. I’ve done two factory resets, wiped the partition cache—nothing helped.

I installed GSam Battery Monitor and noticed that the phone doesn't enter deep sleep due to “Prevent Sleep by AssistantDelay.”

Using PowerShell and ADB:

while ($true) {

  adb shell dumpsys power | Select-String "AssistantDelay"

  Start-Sleep -Seconds 3

}

I see various native Samsung apps appearing, which I’d prefer not to disable. When I tried disabling one, another would activate in its place, and it kept going like that.

I’d really like to understand what’s causing this. I assume it’s a software-related issue, so sending the phone in for warranty service would likely be pointless.

I’ve disabled both Bixby and Google Assistant/Gemini.

Can anyone help me figure out what to do?

 

[arianwen27]

A little explainer for it. Some of us don't just get a device and are happy with it. Developer options and debug settings exist for a reason. I'd like to know the intricate workings of my device and tweak it. Same with my pc, my bios is heavily customised.

The fact I can connect my phone to my pc and tweak it exactly how I want, viewing everything it's doing is the heart of android. If I wanted a device that just worked I'd get an iphone.

It's the exploration and tinkering that adds to the device for some people

[efitko]

It’s not going into deep sleep—that’s the whole reason I started digging into this. Take a look at the stats from last night. I lost about 40% battery, and only 12% of the total screen-off time was spent in deep sleep.

[arianwen27]

Ah, deep sleep, deep doze and light doze are all different things. Seems that app only shows deep sleep.

During the "awake" part, your phone will actually be in deep doze. It won't be just awake.

From some research, deep sleep is a total cpu off sorta thing. Only for when absolutely nothing is going on.

Deep doze is used a lot, almost all the time the screen is off. The cpu is technically still on but the not doing anything. Internet and app activity is all disabled among other things. While in this mode, maintenance cycles start where the phone wakes up for a few seconds, sees if anything is new, then goes back to sleep. This mode is used when the device is stationary.

Light doze is the same as deep but is used when the device is in movement. Most of the limits apply but some tasks are still done. Since you're probably walking with your phone in your pocket, it needs to be ready for you.

So tldr, modern android uses doze modes almost all the time. True deep sleep is kinda an older system reserved for when absolutely nothing is going on. Doze modes are used to allow deep sleep to happen. As in deep doze, wake locks are ignored, allowing the cpu to sleep.

This is all way beyond what a normal person would need to worry about but rn I'm enjoying researching this

[efitko]

I’m doing this because my new phone can’t even last a full day on a single charge, even though I only have about 3 hours of screen-on time in total. Of course, after the factory reset, I did a clean install and didn’t transfer anything—except for Wi-Fi passwords via Samsung Cloud. I even backed up my SMS messages separately.

– If your phone were draining 40% of its battery overnight for no reason, wouldn’t you be looking into it too? – That’s also why I’m using additional apps to monitor the battery, because the native battery app doesn’t show deep sleep! I come from the XDA community where I’ve also been trying to solve this issue, but so far without success—so I’m trying all forums I can.

And yes, I know what ADB is and what it does.

[arianwen27]

Update time. Left my phone overnight to see what happens. Dropped maybe 12% and stats are showing it was in deep sleep the entire time. Looks about 1-2% per hour. I'm seeing 450 wake requests for assistant but the total time of them is 1.5 minutes. Meaning I'm seeing no issues at all in battery drain

[efitko]

Thank you, at least I know I’m not alone in this