Cell Standby drains battery when in Airplane Mode (wifi enabled)

[zmcNTP4fM9Kg]

I have a Nexus 6P that I flashed to the Copperhead OS, when I heard it became available. So far, I've been very pleased with it - great work! I've encountered one annoying issue where my battery will drain at least 50% per day and attribute it to Cell Standby in the Android battery monitor app. I only encounter this issue when I place my phone in Airplane mode. When the battery is draining, I have excellent wifi reception.

Cell Standby (random sample from today, 23% used so far)
Time without a signal: 0%
Mobile radio active: 4h 14m 52s
Computed Power Use: 782 mAh

This issue reminds me of the similar Android 5.02 issue: https://code.google.com/p/android/issues/detail?id=170697

[GarrettGotu]

As per my other bugtracker submission yesterday, I'm getting very similar issues.
I thought it was related to LibreSignal, using websockets, but it wasn't.
Will be happy to provide logcat dump.

I only get this issue when wifi is enabled (Connected or not, still causes this issue)

I've reflashed 3 times now, happens after the first reboot regardless of what apps you have installed (I got it with none or some additional)

[GarrettGotu]

As per my other bugtracker submission yesterday, I'm getting very similar issues.
I thought it was related to LibreSignal, using websockets, but it wasn't.
Will be happy to provide logcat dump.

I only get this issue when wifi is enabled (Connected or not, still causes this issue)

I've reflashed 3 times now, happens after the first reboot regardless of what apps you have installed (I got it with none or some additional)

[thestinger]

Probably not related to CopperheadOS features but rather is an issue in AOSP. I have a few ideas about things that are different from stock though, so might get fixed in some upcoming changes. Same potential cause as #344.

[thestinger]

Probably not related to CopperheadOS features but rather is an issue in AOSP. I have a few ideas about things that are different from stock though, so might get fixed in some upcoming changes. Same potential cause as #344.

[thestinger]

AOSP is missing a build feature which seems to lead to some power saving related code not being included on the 5X and 6P. Remains to be seen if it makes any difference though.

[thestinger]

AOSP is missing a build feature which seems to lead to some power saving related code not being included on the 5X and 6P. Remains to be seen if it makes any difference though.

[zmcNTP4fM9Kg]

Thanks for taking a look at this, I know this must be a labor of love and I appreciate your efforts. I'll keep tweaking settings to see if I can find anything useful to the community.

Minor note - I think thestinger meant to reference this bug #346, adding a note. Apologies if I'm mistaken.

[zmcNTP4fM9Kg]

Thanks for taking a look at this, I know this must be a labor of love and I appreciate your efforts. I'll keep tweaking settings to see if I can find anything useful to the community.

Minor note - I think thestinger meant to reference this bug #346, adding a note. Apologies if I'm mistaken.

[thestinger]

No I meant #344.

[thestinger]

No I meant #344.

[thestinger]

As I've said elsewhere, I highly doubt that issues like this are caused by any CopperheadOS features. I don't want to run a tracker for all issues in AOSP. Google already has one. There's now a workaround for yet another AOSP bug that's not present in stock (CopperheadOS/platform_build@600d75d) but it's unlikely it's related to this. If you want to fix AOSP issues, you need to tell me the fix as #344 did rather than the symptom.

[thestinger]

As I've said elsewhere, I highly doubt that issues like this are caused by any CopperheadOS features. I don't want to run a tracker for all issues in AOSP. Google already has one. There's now a workaround for yet another AOSP bug that's not present in stock (CopperheadOS/platform_build@600d75d) but it's unlikely it's related to this. If you want to fix AOSP issues, you need to tell me the fix as #344 did rather than the symptom.

[thestinger]

It may also be a bug that's also present in stock, or not a bug at all. High power usage is completely normal if you have poor reception.

[thestinger]

It may also be a bug that's also present in stock, or not a bug at all. High power usage is completely normal if you have poor reception.

[thestinger]

Here's an example of power saving code that wasn't being used, but is now enabled with #344 fixed: https://android.googlesource.com/device/lge/bullhead/+/android-6.0.1_r54/power/power-8994.c. None is directly related to cell standby AFAICT, but it's possible that something changed. Next release will have these assorted hardware tweaks that were supposed to be there but AOSP didn't have the code to enable them.

[thestinger]

Here's an example of power saving code that wasn't being used, but is now enabled with #344 fixed: https://android.googlesource.com/device/lge/bullhead/+/android-6.0.1_r54/power/power-8994.c. None is directly related to cell standby AFAICT, but it's possible that something changed. Next release will have these assorted hardware tweaks that were supposed to be there but AOSP didn't have the code to enable them.

[Rudd-O]

That is real fishy. The radio should NOT be on — that's the whole point of Airplane Mode.

[Rudd-O]

That is real fishy. The radio should NOT be on — that's the whole point of Airplane Mode.

[thestinger]

The power statistics aren't necessarily accurate. Either way, this isn't a CopperheadOS issue making it out-of-scope for this bug tracker.

[thestinger]

The power statistics aren't necessarily accurate. Either way, this isn't a CopperheadOS issue making it out-of-scope for this bug tracker.