The Sony Xperia Z has a battery STAMINA mode, which gives you at least 4 times longer standby time, so there is no worry about running out of power. However, several reports reveal that the STAMINA power saving mode does not functioning properly with the latest 10.1A.1.434 firmware. Even if you switch on the STAMINA mode there will not be seen any change.
Though there is no any official fix available from Sony yet, you can temporarily fix the issue by clearing the data from the ‘Eco mode controller’. Here is how it is.

Xpera Stamina Mode


Go to Settings -> Apps -> All apps.

Scroll down until you see a program called “Eco mode controller” and tap it.

Now, tap Force stop and then tap Clear data.

Restart your Sony Xperia Z. That’s it! [Via]

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Kannan is a computer and Android enthusiast, a blogger by passion and a tech freak. His always ready-to-help attitude, knowledge and hard work is what drives him.