I just installed Cyanogenmod 13 and a couple of Google Apps (the OpenGApps Micro Package) on a Nexus 4 mako Device. Trying to disable battery optimization for some apps, I found that in the batter settings screen I cannot select Battery optimization from the action menu. The item is simply not clickable. One can reach the battery optimization screen from Settings -> Apps -> Settings -> battery optimization, too, but then the selector going from not optimized to all apps is not clickable.
Am I missing some dependency or is this a bug? I have recovered some system settings by TitaniumBackup, maybe something was incompatible with CM? (Before, I ran an AOSP marshmallow rom, too).
