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massive screen drain after 2.3 update

Discussion in 'Android Devices' started by erry, Aug 9, 2011.

  1. erry

    erry Well-Known Member
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    everything else seems to be great but even with my brightness on manual and set to 10% with a very dark back ground- my screen seems to be draining the hell out of my battery-

    its been unplugged for about 2 hours- battery has dropped to 71%

    these are the stats

    display- 71%
    wifi- 8%
    cell standby-%
    phone idle- 4%
    com. htc. launcher- 2%
    friendcaster- 2%
    android system- 2%

    the only thing i can think of is the dark pattern i am using is from a backgrounds app- but i couldn't think of another way of getting a dark pattern- cos after the update i wiped the stock ones

    any suggestions?

    should i just reinstate the stock ones?
     

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  2. ifb-online

    ifb-online Android Enthusiast
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    Is this an AMOLED screen Desire or an SLCD one?If the former (AMOLED), a dark background will save battery as the consumption goes up the brighter the screen gets. With SLCD it probably won't mak any difference as the back light will be the determining factor.

    Ian
     
  3. erry

    erry Well-Known Member
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    i only got it in january- so i'm pretty sure its an SLCD one


    it just seems like a massive gap between the screen usage and all the other functions?
     
  4. SUroot

    SUroot Android Expert
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    What was your screen on time?

    Dont pay any attention to the gap this can be easily explained.
    As Adnroid kernels get more battery efficient, in co-op with the android OS, CPU using functions use less power, so their percentage decreases, meaning things who use the same power apparently increase (it must always add up to 100%)

    The screen is a constant drain. 10% brightness on Froyo = 10% brightness on GB (the same) but the CPU may be using less power than before.

    Look at it this way. Imagine there are only 2 components. CPU and Screen. We will invent a battery usage amount called bat.


    Froyo
    CPU uses 5 bat
    Screen uses 5 bat

    These are equal, so CPU uses 50% and Screen uses 50%

    GB
    CPU uses 2.5 bat
    screen uses 5 bat

    CPU uses 33.3 %, screen uses 66.6%

    Also, imagine fewer things use as much CPU. Better web browser. Browser uses less CPU when browsing the web, meaning CPU is not going up much, but screen is.

    So many variables to be honest. The only true indications are your screen on time.
     
  5. erry

    erry Well-Known Member
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    on time is 35 minutes

    (out of 2hrs and 52 minutes since unplugged)
     
  6. SUroot

    SUroot Android Expert
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    so 35 Minutes screen on using 71% of 29% battery (so 20.5% Battery for screen on) seems reasonable to me for a mid to high % display brightness
     
  7. trevytrev

    trevytrev Well-Known Member
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    Unless I'm imagining it, my screen seems brighter since the update so I've just turned the brightness down. It's a simple idea but it worked for me.
     
  8. SUroot

    SUroot Android Expert
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    I run mine at 0% or Auto brightness if needs be.
     
  9. Roboffabike

    Roboffabike Newbie
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    I have found this too, Display is usually the biggest battery % drain now.
    Also agree that 'auto-brightness' seems brighter than before.
     
  10. Meh

    Meh Well-Known Member
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    I found this on custom 2.3 ROMs as well as the official 2.3 update so it's a GB thing rather than a HTC thing. I keep my brightness at 33% ish (the middle of the three options on the power widget) unless I'm outside in bright sunshine. I use a dark wallpaper (the plainish dark HTC one from the RUU pack) and have never figured out if its an AMOLED or SLCD handset (refurb).
     
  11. SUroot

    SUroot Android Expert
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    Put the black wallpaper on and stand in a dark room or with a big towell over your head. If you can see light bleed from around the edges, its SLCD. A pixel on AMOLED screens is off when displaying pure black. LCD is back lit to produce "black"
     
    Tyseyh and Meh like this.
  12. Meh

    Meh Well-Known Member
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    Cheers. No bleed, so looks like AMOLED for me :)
     
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