I bought a Tab Pro 8.4 and decided to install Cyanogenmod 11 on it (currently on M12).
When I check my Battery usage under Settings after leaving it alone for several hours, "Android OS" is shown to be using over 60%. I tried using the Wakelock Detector app, and that didn't show any rogue apps. The "total wake time" in WD also closely matches the "keep awake" time for Android OS in Settings>Battery. There's even been a few times that my device didn't go into deep sleep at all.
Restarting the device didn't help as the problem would come back after an hour. I've tried several fixes, including doing clean install, turning off auto-sync, using Greenify to freeze apps, and wiping my external SD card. None of them worked, but now I think I've found the source of the problem.
If I turn off my wi-fi, "Android OS" no longer shows up at the top of my Battery page. Turn wi-fi back on and the problem comes back. Turning sync off doesn't change anything, so it seems like the issue is with the wi-fi itself and not with syncing apps. I even went into advanced Wi-Fi settings and changed it to 'turn off wi-fi during sleep' and still had the battery drain. Changing the "Wi-fi Optimization" setting doesn't do anything either. I do notice sometimes when using my tablet that I don't have as many bars (on the wi-fi symbol in the status bar) as I do on my phone.
Does anyone have experience with this wi-fi issue? My S3 phone doesn't do this. I assume that the problem is that my tablet device has a bad wi-fi connection and is always scanning or something, but I have no idea where to go from here.
When I check my Battery usage under Settings after leaving it alone for several hours, "Android OS" is shown to be using over 60%. I tried using the Wakelock Detector app, and that didn't show any rogue apps. The "total wake time" in WD also closely matches the "keep awake" time for Android OS in Settings>Battery. There's even been a few times that my device didn't go into deep sleep at all.
Restarting the device didn't help as the problem would come back after an hour. I've tried several fixes, including doing clean install, turning off auto-sync, using Greenify to freeze apps, and wiping my external SD card. None of them worked, but now I think I've found the source of the problem.
If I turn off my wi-fi, "Android OS" no longer shows up at the top of my Battery page. Turn wi-fi back on and the problem comes back. Turning sync off doesn't change anything, so it seems like the issue is with the wi-fi itself and not with syncing apps. I even went into advanced Wi-Fi settings and changed it to 'turn off wi-fi during sleep' and still had the battery drain. Changing the "Wi-fi Optimization" setting doesn't do anything either. I do notice sometimes when using my tablet that I don't have as many bars (on the wi-fi symbol in the status bar) as I do on my phone.
Does anyone have experience with this wi-fi issue? My S3 phone doesn't do this. I assume that the problem is that my tablet device has a bad wi-fi connection and is always scanning or something, but I have no idea where to go from here.
Written by dd
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