WiFi battery drain on Android 9.0 Pie
On the picture below you can clearly see when the WiFi is switched on and off. There's a sharp drop for the first hour when WiFi was on then a very very slow drop when WiFi is off. Again a sharp drop when on and a slow drop when off afterwards.
Mobile data and bluetooth are on at all times. The phone has been factory reset and I've also re-flashed the full OTA image via adb sideload and it's still the same.
Any ideas? At this rate I'm thinking about re-flashing Oreo.
So yeah this is very strange. I've been speaking to somebody with a Netgear router who has also noticed massive drain when WiFi is turned on but normal when it is off.
As my SSID is hidden I've also created a guest network on my router with a visible SSID and...again, the same high drain.
I tested repeatedly and couldn't reproduce the issue when using DHCP.
So android seems to get large battery drain when connecting via static IP.
I'm going to test on my Nexus 5, too, to see if the issues went back to Marshmallow. I'm just glad it wasn't anything specific to my router model/brand or Pie.
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