is undervolting safe and does it save battery? worth it? - Nexus One Q&A, Help & Troubleshooting

and most importantly how is it done?

84 veiws but nor responses? I thought this would be a hot topic seeing as its supposed to do wonders for battery life

Undervolting saves me battery life. And, more importantly, all you have to do is change your kernel - not that difficult.
Sent from my Nexus One using XDA App

do certain roms require certain kernels to function properly or are they independant? any risk bricking your phone?

seeking said:
84 veiws but nor responses? I thought this would be a hot topic seeing as its supposed to do wonders for battery life
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I wouldn't go lower than 925mV kernels for the Nexus One.
Use a good kernel and a good ROM, and just by doing that, you're got better battery life. Oh, and never, ever, EVER, use a task killer. They're completely pointless.

seeking said:
do certain roms require certain kernels to function properly or are they independant? any risk bricking your phone?
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Most ROM's have at least the stock kernel built in, but it's usually safe to flash any kernel on any ROM, so long as the OS matches.
Make a backup before you do anything. If you've got a working ROM, back a nandroid backup, then flash to your heart's content. If the phone decides not to boot, just yank the battery and then boot into recovery (hold trackball + power button) and restore your backup.

thanks for the help
are there any recommended kernels for cm6 rc2 right now? I'm looking to get the best battery life I can with out damaging my phone

seeking said:
thanks for the help
are there any recommended kernels for cm6 rc2 right now? I'm looking to get the best battery life I can with out damaging my phone
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Try the 925mV CFS 1113 Mhz kernel from: http://forum.xda-developers.com/showthread.php?t=693375
If you don't install setcpu it will stay at the stock 998 Mhz, so don't worry about overclocking if you don't want that.

Related

kernel and rom pairing question

im on di11igafs 5.2 newest rom with Firebirds newest kernel flashed. I want to switch to SetrioNs kernel here for some good overclocking. I am unsure which to use and what the difference between his normal and XT versions are. i tried flashing the newest 1.6ghz XT SetrioNs but it freaked out my phone even in recovery menu after 20 seconds it would freeze up after about 20 seconds. Do i need to disable the lagfix in the recovery menu and or something else first? any help would be greatly appreciated . Thanks
Bryan
Your phone is not going to do 1600 no matter how hard you try.
newter55 said:
Your phone is not going to do 1600 no matter how hard you try.
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/facedesk
Thats not what I asked about nor did I try to set it at 1.6 ghz. The phone wouldnt even boot long enough for me to change the voltage control settings. So I suppose i should rephrase my question so I dont get another answer like this one. I would like to use SetrioNs kernel, im using Firebirds kernel right now. Are there any steps i need to take in order to properly flash setrions kernel so that i dont have the problems I had previously?
newter55 said:
Your phone is not going to do 1600 no matter how hard you try.
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Party pooper.
I know right? Woot woot.
Ok, sorry man. Honestly I would suggest downloading the Paragon rom and yanking the kernel out of that. It is much more up to date and allows oc.as high as 1.6. I have used that one without issue. Haven't tried setirons in quite a while so I don't know what may be going on.
Easiest way is to just put the rom zip in your sd card then use sgs kernel flashed app and select the rom zip. It will extract the kernel and flash it for you. Might want to disable lagfix first as sometimes problems occur when jumping back and forth between firebird and others.
Use voltage control 3.0 to control that kernel as well.
newter55 said:
Ok, sorry man. Honestly I would suggest downloading the Paragon rom and yanking the kernel out of that. It is much more up to date and allows oc.as high as 1.6. I have used that one without issue. Haven't tried setirons in quite a while so I don't know what may be going on.
Easiest way is to just put the rom zip in your sd card then use sgs kernel flashed app and select the rom zip. It will extract the kernel and flash it for you. Might want to disable lagfix first as sometimes problems occur when jumping back and forth between firebird and others.
Use voltage control 3.0 to control that kernel as well.
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Ah! Thank You Thats exactly what i was looking for. I only have one question left. If i pull the kernel out of the rom will it be in .tar form? Thanks again
The kernel will be zimage. You can just copy that file straight to your sd card and the kernel flasher app will work with that as well.
Also it would seem that paragon is now using speedmods kernel. would you happen to be able upload the kernel you are using for me?
Give me a few.. have to get off the couch
here you go: http://dl.dropbox.com/u/11343737/zImage
Kernel from ParagonRC4
newter55 said:
Your phone is not going to do 1600 no matter how hard you try.
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I got my phone OC to 1600 it was awesome...My screen couldn't handle it though. It froze
Stephenxda said:
I got my phone OC to 1600 it was awesome...My screen couldn't handle it though. It froze
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you are lucky, usually they melt
What are you talking about here. I have my phone oc at 600Mhz and it works just fine. It is very stable and I have no issues with it.
newter55 said:
here you go: http://dl.dropbox.com/u/11343737/zImage
Kernel from ParagonRC4
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Click to collapse
Hey man thanks alot
no problem....sorry the humor in my original post didn't come through
newter55 said:
no problem....sorry the humor in my original post didn't come through
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Click to collapse
Haha not a problem. It just seemed like any post i made today i was getting sarcastic answers XD

how to fix galaxy note overheat while playing games and surfing net ?

hii i m using galaxy note and i have a problem since long time when i play games like modern combat 3 , asphalt 6 7 etc my mobiles screen and area near camera becomes very hot ! my Baseband version is N7000DDLR1 , KERNEL VERSION - 3.0.15-N7000DDLR6-CL968032 [email protected] #3 SMP PREEMPT DRI JUL 27 17:50:43 KST 2012 , BUILD NUMBER - IMM76D.DDLR6 ! is this a software problem ! if this a software problem plz tell me how to flash a kernel and rom which can solve my overheating issues ! plzz help . waiting for your reply ! thankx in advance
Moved To Q&A​
Please post questions in the Q&A section.​
its just normal.
Sent from my GT-N7000 using xda premium
your phone will get hot as the cores process heafty info. As said above its quite normal and nothing to worry about. Unless of course you actually mean 'overheating' like you are getting reboots and FC all the time?? If not then its not OVER heating its just getting hot.
Try to change your kernel. I see that you are still using stock kernel.
The best kernel for my device last time I tried to reduce the heat is speedmod. Though you may choose other kernels which suit your device more.
But if you decide to flash any kernel, read the thread you are visiting first carefully before proceeding. All the OP has stated very clear on how to flash the kernel.
Good luck!
edit :
but once again, as what others say... heating in android when you are using for heavy games, is normal.
but when surfing, should not be as hot as playing heavy games.
Sent from the corner of this rounded earth.
I'm on CM9, I just underclock to 1000Mhz and set it to performance so it's at 1000Mhz all the time while playing. Works fine for the games I play. Don't try playing while charging, it gets insanely hot.
You can install any app that would monitor your motherboard temp (or battery temp actually? I notice that they are always the same temp)
Anyways, I use Cool Tool from the android market..
I just noticed that my note reaches ~54-55 degrees celcius when I play GTA III + charger plugged in.. normal operating temp of my note is ~38 degrees..
I know its kinda hot to the touch but I'm confident because I know from my background in electronics that the components are designed to withstand temps higher than that.. :highfive:
Abhijeet Dhuri said:
hii i m using galaxy note and i have a problem since long time when i play games like modern combat 3 , asphalt 6 7 etc my mobiles screen and area near camera becomes very hot ! my Baseband version is N7000DDLR1 , KERNEL VERSION - 3.0.15-N7000DDLR6-CL968032 [email protected] #3 SMP PREEMPT DRI JUL 27 17:50:43 KST 2012 , BUILD NUMBER - IMM76D.DDLR6 ! is this a software problem ! if this a software problem plz tell me how to flash a kernel and rom which can solve my overheating issues ! plzz help . waiting for your reply ! thankx in advance
Click to expand...
Click to collapse
it is normal for the phone to get heated up when playing games that uses the full power of the CPU/GPU. Only if you have your phone heating up under normal use, you need to worry. I guess all phones get heated up when playing MC3 or Asphalt. Correct me if I'm wrong.
yes i agree that while playing games note,s area near camera becomes hot and i think it is normal ! but what about the screen my notes screen also becomes extreme hot and it is very hard to play on a hot screen ! Which kernel will fix this problem ? if i flashed a speed mod kernel then how can i come back again on my stock kernel ?
antique_sonic said:
Try to change your kernel. I see that you are still using stock kernel.
The best kernel for my device last time I tried to reduce the heat is speedmod. Though you may choose other kernels which suit your device more.
But if you decide to flash any kernel, read the thread you are visiting first carefully before proceeding. All the OP has stated very clear on how to flash the kernel.
Good luck!
edit :
but once again, as what others say... heating in android when you are using for heavy games, is normal.
but when surfing, should not be as hot as playing heavy games.
Sent from the corner of this rounded earth.
Click to expand...
Click to collapse
how to flash speedmod kernel ? i m new to this flashing roms and kernels and i dont want to brick my device ! plzz tell me the safest way to flash !
Abhijeet Dhuri said:
how to flash speedmod kernel ? i m new to this flashing roms and kernels and i dont want to brick my device ! plzz tell me the safest way to flash !
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I would agree with the previous posts. If your Note is overheating playing Angry Birds or Chess then there is a problem, but not if you are playing more data intensive games. it's dual core running at 1.4 so it should deal with most things you throw at it.
If you are using seriously data intensive games / apps, you could try a kernel which can be overclocked to 1.6 (Hydracore Extreme is an example). You will find it on Chasmodo's EXCELLENT Kernel Repository. Download the kernel, reboot to Recovery and flash the zip file.
Download the No Frills CPU app from Play Store and you can set the CPU to 1.6. Personally, I cant think of many reasons why you would need that but the option is there.
I hope this helps. Please hit THANKS if it did.
Alba Donzo said:
I would agree with the previous posts. If your Note is overheating playing Angry Birds or Chess then there is a problem, but not if you are playing more data intensive games. it's dual core running at 1.4 so it should deal with most things you throw at it.
If you are using seriously data intensive games / apps, you could try a kernel which can be overclocked to 1.6 (Hydracore Extreme is an example). You will find it on Chasmodo's EXCELLENT Kernel Repository. Download the kernel, reboot to Recovery and flash the zip file.
Download the No Frills CPU app from Play Store and you can set the CPU to 1.6. Personally, I cant think of many reasons why you would need that but the option is there.
I hope this helps. Please hit THANKS if it did.
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which is the best kernel for gaming which can give me more battery life and will heat my note less ?
Abhijeet Dhuri said:
which is the best kernel for gaming which can give me more battery life and will heat my note less ?
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Click to collapse
I don't think there is such a thing as a "best kernel", it's really a matter of personal choice. Speedmod, Franco, Chainfire and Hydracore are all excellent on Stock based ROMs, depending on your personal preference. I would recommend flashing each one, see how it suits your own requirements and then try another. Hydracore is accepted by many as the "Universal Kernel" so why not try that one first then gauge the others? You will have a wider selection of Governors and Schedulers to "tweak" the kernel according to yur preference. Personally, Hydracore underclocked to 1000, on Wheatley Governor gives me the best performance and battery for my needs. Ultimately each person will have different uses and therefore different preferences.
I hope this helps. Please hit THANKS if it did.
begovil differentiam
Alba Donzo said:
I don't think there is such a thing as a "best kernel", it's really a matter of personal choice. Speedmod, Franco, Chainfire and Hydracore are all excellent on Stock based ROMs, depending on your personal preference. I would recommend flashing each one, see how it suits your own requirements and then try another. Hydracore is accepted by many as the "Universal Kernel" so why not try that one first then gauge the others? You will have a wider selection of Governors and Schedulers to "tweak" the kernel according to yur preference. Personally, Hydracore underclocked to 1000, on Wheatley Governor gives me the best performance and battery for my needs. Ultimately each person will have different uses and therefore different preferences.
I hope this helps. Please hit THANKS if it did.
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Click to collapse
yes i was just reading the thread and i saw that" The OC/UV kernel is undervolted, and in some circumstances can offer significant performance improvements. However, it *may* use more battery and you phone will get a little warmer." this was written in the thread . how is the abyss note kernel ?
Abhijeet Dhuri said:
yes i was just reading the thread and i saw that" The OC/UV kernel is undervolted, and in some circumstances can offer significant performance improvements. However, it *may* use more battery and you phone will get a little warmer." this was written in the thread . how is the abyss note kernel ?
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Click to collapse
i was reading the hydracore thread
Abyss is a Gingerbread kernel so not compatible with ICS or JB ROMS. I don't believe there is such a thing as a "one size fits all" solution. I haven't found any kernels to be "battery killer". Screen, GPS, 3G and WiFi kill the battery.
The joy of 'droid is the customization.
Alba Donzo said:
Abyss is a Gingerbread kernel so not compatible with ICS or JB ROMS. I don't believe there is such a thing as a "one size fits all" solution. I haven't found any kernels to be "battery killer". Screen, GPS, 3G and WiFi kill the battery.
The joy of 'droid is the customization.
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Click to collapse
ok i m ready to flash hydtracore OC ! bt if i want to go back to my stock kernel then can i go back and is there any chances of brick and loss of data ?
Abhijeet Dhuri said:
ok i m ready to flash hydtracore OC ! bt if i want to go back to my stock kernel then can i go back and is there any chances of brick and loss of data ?
Click to expand...
Click to collapse
Please read the Kernel Repository to make sure you are comfortable with what you are doing. Hyrdracore is a Safe kernel, I would recommend trying the Standard version first (not the Extreme version). As always, you flash at your own risk. Please read before you flash.
Alba Donzo said:
Please read the Kernel Repository to make sure you are comfortable with what you are doing. Hyrdracore is a Safe kernel, I would recommend trying the Standard version first (not the Extreme version). As always, you flash at your own risk. Please read before you flash.
Click to expand...
Click to collapse
what is difference between extreme and standard ? and to flash kernal i have both CWM and also pc odin which one should i use ?
Extreme: OC and UV available
Standard: No such things as above

Custom kernel and maintaining slow charge rate?

Hi all,
Is the slow-to-charge behaviour of the HTC One hardware based or controlled by the kernel? I'm running the Bulletproof kernel but I want to ensure that the charge characteristics are the same as stock (for battery longevity).
Assuming the use of the stock OEM wall-charger, and USB fastcharge left off in the kernel, should the charge rate be the same between stock and Bulletproof?
Thanks in advance.
HighOctaneTT said:
Hi all,
Is the slow-to-charge behaviour of the HTC One hardware based or controlled by the kernel? I'm running the Bulletproof kernel but I want to ensure that the charge characteristics are the same as stock (for battery longevity).
Assuming the use of the stock OEM wall-charger, and USB fastcharge left off in the kernel, should the charge rate be the same between stock and Bulletproof?
Thanks in advance.
Click to expand...
Click to collapse
Yes it will be the same if you left USB fastcharge off in the kernel installer, btw I recommend you try faux's kernel and you can download the faux kernel enhancement app from the play store and you can tinker with the settings using the app anytime you want instead of going through the installer and it has really nice settings but anyway I digress
Yes it will be the same if you left USB fastcharge off in the kernel installer, btw I recommend you try faux's kernel and you can download the faux kernel enhancement app from the play store and you can tinker with the settings using the app anytime you want instead of going through the installer and it has really nice settings but anyway I digress
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Click to collapse
Thanks very much for replying. In kernel terms all I really wanted was the stock kernel with the ability to write /system (which the stock kernel disallows). Bulletproof seemed to be the closest to stock I could find, but I'll checkout faux as you suggest.
Thanks again.
The phone is very slow to charge even on stock kernel, much slower than any of the other current flagships
ordisaio the
Matt said:
The phone is very slow to charge even on stock kernel, much slower than any of the other current flagships
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Click to collapse
Yup, which is what I'm trying to preserve while using custom kernels. I'm trying to work out if the slow-charging is imposed by the hardware or kernel.
Thanks.
Ah I see. I think it's the hardware as all kernels have the same charge rate. You don't need to worry about battery longevity unless you plan on keeping the phone for 3 years +
Matt said:
Ah I see. I think it's the hardware as all kernels have the same charge rate. You don't need to worry about battery longevity unless you plan on keeping the phone for 3 years +
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Click to collapse
Cool, that seems to be the prevailing theory, I will go with that
Thanks again.

[Q] custom rom for xperia TL lt30at ?

i have official jb 4.1.2 firmware 9.1.F.1.120
which custom rom to put in?tnx,sorry for bad english
Honestly, you should experiment to see what roms work best for you. There are a lot of excellent roms on here made by really talented developers who put in a lot of hard work.
I'm currently using Peetr_ 's Hybrid rom. Even with no undervolting (due to locked bootloader), with only setCPU (set cpu profile to 384mhz-486mhz when screen is off) I'm getting insane battery life- 53 hours of standby time without charging and still ticking at 61% (granted, the phone was actually used for an hour.)
Hope you find something you like.
xperia tl said:
i have official jb 4.1.2 firmware 9.1.F.1.120
which custom rom to put in?tnx,sorry for bad english
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Click to collapse
Which kernel do you use?
Stock kernel (the one that came with the phone).
viper2035 said:
Which kernel do you use?
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magneta said:
Stock kernel (the one that came with the phone).
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Refering to my post in the HybridRom thread: http://forum.xda-developers.com/showpost.php?p=48796459&postcount=1018 Do you know if there is a way to install the stock kernel to a unlocked bootloader phone.
As I have a permanently locked bootloader, I am unable to try out any custom kernels. I do have a Nexus 7 FHD with an unlocked bootloader, and by experience, a custom kernel does help with battery life, as it gives you the option to undervolt the phone, among other tweaks already implemented by the developers of the kernel.
I had a look at the NK kernel features, and it does give you those options. Slight undervolting should help. I suggest sticking with what you have. Remember that the main source of battery drainage would be the screen. My screen is off most of the time, with short timeouts and liberal usage of the on/off button (screen is off when listening to music).
Hope this helps.
viper2035 said:
Refering to my post in the HybridRom thread: http://forum.xda-developers.com/showpost.php?p=48796459&postcount=1018 Do you know if there is a way to install the stock kernel to a unlocked bootloader phone.
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Best setting for Doomkernel

Guys what is the best recommended setting for this kernel?
walkwitmeinhel said:
Guys what is the best recommended setting for this kernel?
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Its all depends on the tolerances of your chipset. What works for one will not works for others.
There are plenty of posts within that thread giving peoples settings.
try some for yourself, and see how you get on, then adjust them and check...
walkwitmeinhel said:
Guys what is the best recommended setting for this kernel?
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Click to collapse
I've never been able to install doomlords custom kernel without having random reboots at some point, I don't believe its to do with the CPU speed as pimps one was just fine. Simply as it comes after a flash, changing nothing I get reboots. Flashing the advanced stock kernel allows me to use my phone without the worry of it rebooting at a time that I need it, I don't feel that I'm missing out on anything either. Not a solution for the custom kernel per say but certainly one for the stability of your device from my perspective. Changing the settings within safe limits and stressing the CPU will allow you to find your CPU/chipsets thresholds. Keep a copy of the advanced stock kernel on your internal memory invade your phone won't boot.
Sent from my C6903 using XDA Premium 4 mobile app
This question is very opinionated. As mentioned each chip is different as is each persons needs and usage. The two replies above are the best you will get, and this question cannot be answered further...
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