I'm seeing following partial wake lock through BetterBatteryStats (inside of Partial Wakelocks) and it seems that, this wake lock keeps my phone awake at all time and prevents deep sleep / doze mode(
*backup* (Andriod System)
I'm using Huawei Nexus 6P (stock, rooted (no mods)) with latest Android 6.0.1 (MHC19Q).
* UPDATE *
I created following:
Issue 207700 - android - Partial Wakelock - Android System backup = NO deepsleep/doze mode - Android Open Source Project - Issue Tracker - Google Project Hosting
workaround(s) (NOT fixes):
reboot- temporarily address issue (until phone is plugged & unplugged to/from charger).
Backup & reset->
Back up my data-> Toggle
Off- long(er) term solution, yet you're left without backup going forward...