HTC Desire :: SetCPU - Save Battery
Sep 11, 2010
Ok just installed this on my Desire and wondering if my settings seem ok.
Initial set up set to ondemand and ticked Set on Boot.
On Profiles I have set as follows;
Sleep/Standby - 576 Max, 245 Min
Power < 80% - 806 Max, 245 Min
Both of these are ondemand also.
Should this be enough to notice some significant battery savings?
Do you reckon I will run into any problems in terms of performance as time goes on? (seems ok just now)
How to save battery but not lose out on performance?
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Jul 8, 2010
I'm sure many people has seen the thread where OverclockWidget was claimed to have increased the battery life for some people. Near the end of the thread I became skeptical and proved that it had in fact no effect on the CPU speeds at all, and so can not save battery life. Well, good news is that a new function in the competing SetCPU app will now get you a real, tested increase in battery life.
According to my tests, my Evo with the screen off should theoretically get a 64 hour battery life!
Know what you're doing? Short version: Get latest SetCPU (version at least 2.0.0) and use Menu -> Perflock Disabler in the Main tab to enable underclocking.
Don't know what I'm talking about? Good, follow this tutorial:
Prereqs:You need to have ROOT. Unrevoked root method is confirmed to work, and so is Toast's root method.
Usually I wouldn't recommend using Unrevoked, but it's just so fast to set up, and perfect for those who have no clue what ROOT means.
Buy SetCPU from the market, or download it from XDA forums for free. Please support the developer of this incredible app! The version must be at least 2.0.0b
Be on the STOCK kernel. If you're on a custom kernel, chances are that perflock has already been disabled, and you won't need this tutorial to underclock. Some custom ROMs come with the stock kernel (like Fresh 0.5.3) and some don't (like Baked Snack .9.6)
Alright, got the prereqs down? Lets start this.
HOWTO:Open SetCPU and give it root permissions as necessary. As a control, go into the Info tab and do the Long Bench a few times. You should get around 1000ms.
Go to the Main tab, hit MENU, hit Perflock Disabler (read the warning!), and hit Disable Perflock Beta: May crash!
It will work for a while, and then say it's successful. You can then click the X on the top right to exit the Perflock Disabler.
Go into the Main tab and drag Max: all the way down to 245000 (245Mhz). Make sure the green xxx max xxx min label above the sliders show 245 for both and also disable any Profiles you've set. Go to Info tab, then hit Long Bench again. This time you'll get something ridiculous like 5000ms, meaning that the Perflock Disabler has worked!
Change your settings Profile tab to something similar to my settings. You can mess around with the Battery < xx% profiles to fit your needs. Your exact Profile priorities do not matter, it's only important that some have HIGHER priority than others. On the Main tab, set Max all the way to the right (998400) and Min all the way to the left (245000), Scaling to ondemand, and check Set on Boot. Do not check Set on Boot yet if you're the super careful kind. You can check it later when you've tested that your phone isn't crashing
The last entry is Battery < 100%, set at lowest priority, with MAX as the highest value, MIN as the lowest value, and scaling as ondemand.
Congratulations you're now able to underclock your Evo!
Comparison:
The only applicable parts is after the charging finishes (after the solid green bar ends)
Before Perflock Disabler:
After Perflock Disabler:
See that little dip at the end? That's when I was turning the screen on and messing with the phone for this tutorial. What a difference.
Disadvantages:Yes, not everything is happy and pretty. As the Perflock Disabler warning says, you HAVE to apply the Perflock Disabler on every boot. If you forget, then your SetCPU settings will have no effect on the Evo. Install a custom kernel that already has Perflock disabled if you do not want to do this on every boot.
Also, since this clocks the Evo down when the screen is off, you may get a slight (super slight!) delay when you turn the screen back on. This is because the profile changes from Screen Off to Battery < xx% and SetCPU needs to clock the CPU from 245mhz to 998mhz.
FAQ:
What is Perflock Disabler?
HTC added a "perflock" in their stock kernels to prevent over/underclocking. SetCPU's Perflock Disabler, like its name implies, disables this restriction.
How come your screenshots show that you can go down as high as 1.19Ghz and as low as 128Mhz?
I'm using this custom kernel.
Will this work with OTA update xxx.xxx.xxx.xxx?
Yes, as long as you have root, and don't lose it when you update (do your research!) then this will work.
What are your settings?
Wifi ON, Bluetooth OFF, GPS ON, Mobile network Data OFF (ATT contract with dumbphone still not over), Screen Timeout 1MIN, Brightness AUTO, Advanced Task Manager set to SAFE kill tasks when screen is off.
What is that cool looking battery monitoring app?
That's SystemPanel, paid on the market. A free alternative is JuicePlotter, also on the market. Screenshots were taken with Drocap2.
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Aug 7, 2010
Does setcpu speed up the Moment at all or is its only real use for downclocking to save battery?
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Sep 6, 2010
SetCPU claims to be able to increase your battery life by limiting the speed your processor can run at. This seems like sound reasoning at first, but then I remember roughly what a CPU is and how it works...
So let's say you've set a profile so that when the screen is off it will be limited to half the clock speed; around 500mHz. Lets then say your email wants to get updated, so your processor chugs away that that. If it was set to full capacity it may take say, 1 second to complete the task then go back to it's idol state. With SetCPU limiting it, it would take twice as long and would still use exactly the same number of cycles as before.
In fact, when you think about it, it doesn't actually matter what speed your phones processor is running at all the time, what matters is how much work you're asking it to do. Surely the best and only way to increase battery life is to simply have your processor complete less tasks, therefore using less clock cycles? Sending a text message uses the same amount of clock cycles no matter what your max setting is, so as a result uses the same amount of power.
If anything, having SetCPU running all the time just gives your phone more work to do and therefore decreases battery life?
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Jul 11, 2010
With SetCPU? It does not save settings across reboots, so I have to go into it everytime and read just the sliders, even with "Set on boot" checked.
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Jun 11, 2010
Just got an HTC Desire through O2 in the UK as an upgrade to my old SE P1i. Happy with it so far, still going through it trying to turn off and disable loads of stuff though. Here's some initial questions:
1) I got the Force Close Button program from the marketplace. Should I be using that to close programs to save battery life?
Or should I just leave everything running in the background? Camera, web browser, email, calendar and whatever else I've ever used since I last cycled the power.
2) Is there a particular Task Manager program I should look at? I've got ES File Manager and notice they do a Task Manager as well but didn't know if there's any others that people recommend.
3) Is there a way to disable the SMS threaded/conversation view in the stock SMS program?
4) And to supress the deletion prompt in SMS?...........
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Jul 13, 2010
I want to state that I LOVE my phone and it perfectly does everything I need it for. I just have a minor problem. With all the tweaks I've done (and redone) I can't for the life of me get my phone to last more then 8 (or less) hours.
Here is my phone settings.
I'm rooted via the new root method (ota simple) from xda. It worked flawlessly and then I installed the dmg rom on the Battery Saver method. Got a little bit of time. THEN I purchased and followed the SetCPU program tweaks and did that to the T. I also have the following: GPS On. Mobile Internet on (no wifi or bluetooth).
I have all "Friends" syncing off but I have my gmail and work email on push (required via my job)
I have my brightness set to almost the lowest and I have to charge my phone about 2pm everyday otherwise my phone is dead.
Typical day: Wake up at 7am unplug phone. Check email/comics then go to work. I'm an IT sys admin and am required to have my phone/answer emails throughout the day. but at least 4 hours the phone is just sitting there or I'm lightly texting on it. But no matter how little or how often I use it it gets about 30% dead about 2pm with ALL the tweaks i've done.
This might make all the difference. I have LOW signal at work and home (1 little bitty bar to none). And my cell standby is almost always above 50%. But with all the tweaks (yes I've done the network app and yes its on CDMA) with PRL and profile updates (rooted and unrooted) it still has the problem.
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Oct 7, 2010
I rooted my phone about 2 days ago and I did a nandroid backup, titanium backup, used titanium backup to freeze some of the bloatware.. Have not yet installed any ROMs or Kernels. I got SetCPU and made several profiles in an attempt to increase my battery life. I wanted to see if it was working so I set up a widget, and despite the fact that my battery was at 20% (I have a <25% battery profile setting) the max was still 998
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Aug 16, 2010
I have tried several different Froyo Roms over the past very weeks. I still can't get any good battery life out of them compaired to running EE3.0. Yet everyone tells me they get better battery life while running Froyo. My phone has currently been unplugged for 9hrs 13 mins. It has a total of 50 mins talk time and I have sent 30+ text messages. My battery level is @ %73 running EE3.0
I can't get a total of 11hrs out of my phone when running any of the Froyo Roms. Ive tried running several different settings on SetCPU but nothing noticable. Only thing I notice is that when running Froyo the largest use of my battery is my Display. Yet when running EE3.0 the largest use is Cell Standby and Display is the lowest. But I have tried turning the brightness almost all the way down on the Froyo ROM but it doesn't make any difference.
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Aug 26, 2010
I just rooted tonight and installed SetCPU. I want to use it for the battery saving capabilites. I created a profile for when the screen is off and activated it, do I also need to check "set on boot" on the SetCPU main page?
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Aug 19, 2010
I figured I would throw my 2 cents in on my battery performance. I was mildly disappointed after the first week of use with my phone. It was without a doubt worse than my old iPhone 3g. I expected this due to larger screen, running widgets, ect. so I am not complaining. However, a couple days ago I downloaded the Set CPU app from the marketplace and set it to minimum every time the screen turns off. The difference is amazing, I have not charged since 7:30am yesterday and just now at 340 I plugged it in, it was around 5% left.
I really wanted to push it and see how much more I could get but I don't want it to die on me tonight, im going to a baseball game so I don't want to be stuck without it.As far as usage, I spent about 45 talking over bluetooth, I have sent about 15 texts and received about the same. I checked Twitter a few times, for a few mins each time. Spent about an hour browsing web, and downloaded a couple apps from the market. Before this I was charging my phone after an 8 hour day at work and had almost no juice left. YMMV but for me this has been well worth the 2 bucks.
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May 27, 2010
What is the best way to set up SetCPU for optimal performance and battery preservation. A balance between the two, I suppose. What profiles do I need to enable and how should I modify them?
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Aug 25, 2010
I am trying to maximize the battery life of my phone. I keep coming across an app refereed to as AUTOKILLER?
Just what is this app, and what are the benefits? If I am running SetCPU, do I need to run both? Do I need Advanced Task Killer too?
(FYI, I am running Cyanogen Tazz 1.0, and besided not having the trackball light up, I am loving it. I just want to get optimized battery life)
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Jun 25, 2010
I was just hoping for some guidelines when using SetCPU as far as profiles, performance and battery life? I know it varies by kernel and right now I am using Chevy's uLV 1Ghz kernel.
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Jun 7, 2010
Ok I'll admit it I've been watching Engadget's live blog of the iPhone 4 debut. Something interesting stuck out at me however. In one of the keynote slides, Jobs pointed out the iPhone actually gets better battery life while on WiFi vs 3G. Normally I switch WiFi off when I'm not using data, syncing will still access 3G when I'm at home and I'll do occasional browsing at home as well. Would I be better off accessing data using WiFi when available rather than 3G? I guess a better way to pose the question is, does the 3G radio use more power then WiFi?
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May 2, 2010
I'm getting pretty crap battery life out of my desire and I've had it over a week now. I'm having to charge twice a day, if not three times a day as I'm canning the hell out of it!) But now as my usage starts to drop, what's the best way to conserve the batttery with quick touches when its not being used? I press and hold the power switch and then select to turn off internet. Does this also prevent stuff going on in the background like sync auto update etc. ? I'm seeing roughly 30 to 40 percent battery being used by the Android system, and about 20 to 30 percent being used by cell standby. There's various settings and ways to stop internet I've found, but is there a way to nip all that energy zapping stuff quickly when the phones not being used, and then activate it again quickly when you wanna have a play. Us there anyway to get those percentages for the Android system down?
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Mar 19, 2013
what is the best way to save battery?
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Jul 7, 2010
I know a lot of people suggest turning off the GPS signal to save battery. My only question is to turn off the gps signal you go to settings->location and then do you just uncheck use GPS satellites, or should you have use wireless networks unchecked also?
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May 4, 2010
I have seen allot of posts stating that you should disable the GPS to save battery. I may be mistaken but if no apps are actively requesting positional data is it not off? I have mine set to on and it does not even register on the battery usage screen.
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Dec 11, 2009
Disable the auto-screen-dimmer, immediately. Remember, even though this shows no process it still has to compute how much/little light it sees and then apply it to the screen. Kicked the brightness down to the lowest and my battery usage went from 60% screen to about 25%, how it should be.
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May 11, 2010
I have Open Advanced Task Killer on my HTC Desire and wondered whether it was actually worth keeping. I usually have quite a lot running most of the time it seems, and I thought perhaps killing some apps every once in a while if I'm not using them would save battery. But is it worth it and is there a better app for this out there if it's worth having one at all?
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May 4, 2010
Ok, so im not really as concerned about overclocking the CPU, but since the phone is basically a computer. I am curious if anyone knows how to undervolt the CPU? This can easily be done on laptops with the help of apps like rightmark CPU. Basically you keep the clock speed the same (or overclock it) but you reduce the voltage at each cpu cycle. You do this on a laptop with an application such as rightmark and you continue to undervolt until your system crashes. Which basically means your CPU has become unstable. Then you raise the voltage a few notches back up to the point before the crash and run it for a few days.why would anyone care? Well the effect is you keep the same speed (or faster) BUT you use less energy.... which means longer battery times. I've undervalued the last 3 laptops I've had two half the voltage. Now my hunt begins for an undervolt app for Android. The semiconductor manufactures leave a "generic" setting. But, each piece of silicon is different, and came from relatively different parts of a wafer. So some parts can hold up to less voltage without becoming unstable. Hence why one cpu can be undervalued dramatically and others (of the exact same chip set) can barely get undervalued without crashing right away. This is why they leave it at a generic safer voltage.
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Mar 12, 2010
Almost 8 hrs, I am seriously looking for the best way of utilizing i7500 battery. I got confused with many advise and setting. Could anyone give a brief of what the setup do we have in samsung?
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Jun 7, 2010
The issue started happening last night after I had tweaked a couple settings to save battery life. I was on a job site today and the phone rebooted 4 or more times within a 2 hour time period. It absolutely killed my battery too. I took my phone off the charger at 9am and by 12:30pm it was @ 15% or so. Luckily I had a spare battery in my pocket. I have since turned back on the "enable always on mobile data" and haven't had any issues since. Battery usage seems a little bit excessive still though. I have had a few smart phones so I know what to expect as far as battery usage.
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Jul 3, 2010
Surface flinger turns off all pixels except for certain colors on OLED displays. Turning on only the red display results in a MUCH increased battery life. Looks like something to be included as an option in new Roms & such.
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Apr 9, 2010
Sounds like the Eris has a feature to disable 3G, which saves tons of battery life. Anybody know if the Incredible will have the same feature? Seems to involve disabling a "mobile network" setting:
http://androidforums.com/htc-droid-eris/19176-optimize-your-droid-eris-battery-life-read.html#post124295.
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May 8, 2010
Just wondering if underclocking my Incredible will save battery life during the day-I can't use my phone much at work-maybe when I go somewhere to pee or grab something to eat-that is about it. I wouldn't care about speed during the day..say if I underclock it to like 400 MHZ, would that save a lot of battery life? I would set it to normal once I was done with work.
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May 15, 2010
As I just got my phone with installed rom 1.6 for the Behold 2, I am frustrating when the battery life drains so fast after last night. I was playing a bit with the WiFi and the battery status bar was still less then half bar. After I woke up today, the battery has shown that the battery is less than 5%. I did turn off my WiFi and using only 2g network to save battery life. I clicked on "why", it showed the Green Bar with the word Android System 95%. What does this mean and how can I save more battery life since I don't use it the whole night. So the phone suppose to be less than half bar battery life at least.
1.Putting the phone in sleep can save battery life or not on the Behold II?
2.What are some ways that can save the battery life on the Behold II?
3.Does the charging technique can at least save some part the of the battery life? If so , How do I charge my Behold II ? Leaving it all drain out, turning off the phone and then charge it ?
Here are some ways that I have read in android forums
1. use spare app
2. use task manager
I didn't try these two.
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Feb 27, 2010
why does weather bug show up advanced task killer even inside the 6 hour time frame I set up for it to update. Wondering If I use the weather bug short cut on my home screen and not the WB widget will that stop it from ever opening/updating unless I open it by tapping the shortcut icon.
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Aug 29, 2010
Follow these steps and you could save yourself the hourly push for emails. (This works for GMail). It sends you a text alert everytime you get an email. Most of the time in a matter of second. I used this method on my iphone to save battery life from email pushing.
- log on to you gmail account
- click on settings on the right top corner
- click on forwarding and pop/imap tab
- in the forwarding section click the "forward a copy of incoming mail to (at this point enter your 10 digit phone number@text.att.net)
- click save changes
You will now recieve a text message whenever you get an email. So all you battery hoggs can keep your push off if you want.
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