Dark would be the lowest brightness setting you use while screen is on, which you use almost all of the time. It is interesting... 88% of the time your screen is on is at your lowest two settings but the lowest settings only contributed to 58% of the power used by the screen. The other 12% of the time on medium & bright, contributed to 42% of the power used by the screen. You can really see how much less power your display uses at the lower settings.
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A question about a gsam reading. On th's screen usage it shows mostly dark but used 49% power. Does dark mean off and shouldn't off be a much lower usage?
Power usage is mostly coming from the backlight. Ironically, if the screen is "black" on LCDs, it is using a little bit more power than when the screen is white. Because of the way LCDs work. A "black" screen is using all the power of a "white" screen because the backlight is still on. A black screen with the backlight on is just blocking out the backlight with the little LCD squares.
Dimming the brightness itself will save power because it is actually reducing the backlight.
I keep my brightness at full all the time. I have auto dimming and auto brightness disabled. I simply turn the display off when I am not using it. So when I am not using the phone, the display is consuming zero power. This has worked far better for me over the years than the various auto-dim schemes.
I installed the new global update via the android police download. Didn't noticed it before, but now my screen doesn't come back on after calls. Could have sworn it did before.
Found another one today, doesn't matter signal strength, even does it over wi-fi. Some browser pages won't load, the whole screen goes white. If I refresh or go back and then forward, it works fine.
For about the past week, when I click "settings". I get the message "unfortunately this application has stopped" I click the "ok", the window goes away and when I click settings again, it works normally. Running .12 OTA.