Post Reply

Why wifi may use more battery? screen shots inside...

21st April 2012, 04:45 PM   |  #21  
JohnCorleone's Avatar
Senior Member
Flag Whittier,CA
Thanks Meter: 5,770
 
15,523 posts
Join Date:Joined: Dec 2010
Donate to Me
Quote:
Originally Posted by studdmufin



Wifi on all night using cm9 alpha 3

Sent from my SPH-D710 using XDA Premium App

Well now...that's what I like to see!! Thanks. Oh and what kernel and modem are you using?

Sent from either ET4G or NS4G using Xparent Tapatalk 2
21st April 2012, 06:47 PM   |  #22  
Member
Thanks Meter: 10
 
44 posts
Join Date:Joined: May 2009
Those are the kinds of results I'm getting with Blazer 4.1/el29. I'm losing about 1%/hr with the screen off and at idle.

BUT, I am using juice defender and it shuts the wifi off.
21st April 2012, 09:12 PM   |  #23  
zanderman112's Avatar
Recognized Themer
Flag SouthEast USA
Thanks Meter: 1,839
 
7,913 posts
Join Date:Joined: Oct 2010
Donate to Me
More
I'm going to test this myself on my Epic 4G running CM9 beta2 later.

Same conditions, 10 minutes screen off, wifi on, no sync.



~ E.R.A.
21st April 2012, 09:18 PM   |  #24  
Senior Member
Thanks Meter: 597
 
1,392 posts
Join Date:Joined: Feb 2010
i would like to add that 10 minute tests like this will accomplish nothing because they're simply not accurate. to get an accurate indicator, try testing while you're sleeping for 7-8 hours, like others have done in this thread.
21st April 2012, 09:47 PM   |  #25  
TeamERA's Avatar
OP Senior Member
Flag Everywhere
Thanks Meter: 309
 
581 posts
Join Date:Joined: Nov 2011
More
First let me thank all of you, Im glad to have some back and forth conversation on this matter. What I am displaying in the OP is that there is some sort of wake lock before wifi is turned off when screen is off, so if you are constantly turning your screen on to view the time, or look at the home screen (anything really that dosnt involve pulling data) while wifi is on, you will use more battery; This may be ICS related, if anything its leak related, since our cm9 uses the leaked kernels.

And thanks John, Im sure the source will fix this if they dont have it fixed at the time of OTA.

@studdmufin, I hope you can see what Im trying to say, as Im not saying one way or the other that wifi/3g is better in standby for times when the phone is idle more than the time it takes for the "turn wifi off when screen off" kicks in; Im only saying that it keeps the phone awake 40% longer in that 10 minute window, so this will harm battery life.

@cnstarz, 10 minutes is a perfect time frame in this case, I think the reason why has been explained in this post.


Sent from my SPH-D710 using xda premium
Last edited by TeamERA; 22nd April 2012 at 12:15 AM.
The Following User Says Thank You to TeamERA For This Useful Post: [ View ]
22nd April 2012, 04:32 AM   |  #26  
coiledwire's Avatar
Senior Member
Flag norcal
Thanks Meter: 696
 
2,213 posts
Join Date:Joined: Oct 2010
Donate to Me
More
The OP provides interesting data. From his screenshots, wifi is a bigger load on the cpu. Even if wifi uses less battery than 3g, this cpu usage looks a place for improvement.

Sent from my SPH-D710
22nd April 2012, 06:54 AM   |  #27  
Member
Thanks Meter: 10
 
95 posts
Join Date:Joined: May 2011
Quote:
Originally Posted by JohnCorleone

Well now...that's what I like to see!! Thanks. Oh and what kernel and modem are you using?

Sent from either ET4G or NS4G using Xparent Tapatalk 2

Modem fd05 and fd10 kernel (I'll probably try out fd19 modem soon cause I hear good things). I'll also will try just 3g tonight and compare the difference

Sent from my SPH-D710 using XDA Premium App
22nd April 2012, 05:06 PM   |  #28  
Member
Thanks Meter: 10
 
95 posts
Join Date:Joined: May 2011
I don't see the use in turning wifi off when screen is off. Wifi drains less when idle because it doesn't have to search for signal plus it is faster and you don't need to wait for it to turn on when your screen turns on

Sent from my SPH-D710 using XDA Premium App
22nd April 2012, 06:22 PM   |  #29  
JohnCorleone's Avatar
Senior Member
Flag Whittier,CA
Thanks Meter: 5,770
 
15,523 posts
Join Date:Joined: Dec 2010
Donate to Me
Quote:
Originally Posted by studdmufin

I don't see the use in turning wifi off when screen is off. Wifi drains less when idle because it doesn't have to search for signal plus it is faster and you don't need to wait for it to turn on when your screen turns on

Sent from my SPH-D710 using XDA Premium App

I am not turning mine off at all anymore. On FD16 mine reconnects when I get as close as 3 houses away now!

Sent from either ET4G or NS4G using Xparent Tapatalk 2

The Following User Says Thank You to JohnCorleone For This Useful Post: [ View ]
Post Reply Subscribe to Thread
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes