[Q] What's Undervolting ?? - Eee Pad Transformer Q&A, Help & Troubleshooting

Sorry for this stupid question but can somebody tell me what's Undervolting and what's it's benefits ??

xMini said:
Sorry for this stupid question but can somebody tell me what's Undervolting and what's it's benefits ??
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It's the opposite of overvlocking..
it's used to have more battery life..

bruuuno said:
It's the opposite of overvlocking..
it's used to have more battery life..
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Isn't "Underclocking" the opposite of Overclocking ?!
I was asking about "Undervolting"...

Same clock speed less voltage so same power while using less juice
Most of the devs will think of everyone so the voltages are quite high but some people only need half that for a certain clock speed some need the full amount so the ones who dont need all that juice can undervolt on almost every frequancy and get mean battery savings!!!!
Sent from my tf101 using xda premium 1.54Ghz

Related

Underclocking the processor?

OK guys so i use an app called CPU Master which can OC and underclock CPU. Question is: will the battery life improve (significantly) if i underclock it to say 600mhz which is good for reading and browsing when I wont be needing the whole 1gHZ?
I know the logical answer is yes but I wanna hear from someone who knows for sure.
Sent from my LG-P999 using XDA App
noobletsausecakebbq said:
OK guys so i use an app called CPU Master which can OC and underclock CPU. Question is: will the battery life improve (significantly) if i underclock it to say 600mhz which is good for reading and browsing when I wont be needing the whole 1gHZ?
I know the logical answer is yes but I wanna hear from someone who knows for sure.
Sent from my LG-P999 using XDA App
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It would improve, because lower voltage, theoretically. But you would seriously impede performance.
Sent from my LG-P999 using xda premium
noobletsausecakebbq said:
OK guys so i use an app called CPU Master which can OC and underclock CPU. Question is: will the battery life improve (significantly) if i underclock it to say 600mhz which is good for reading and browsing when I wont be needing the whole 1gHZ?
I know the logical answer is yes but I wanna hear from someone who knows for sure.
Sent from my LG-P999 using XDA App
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Flashing a UV kernel will extend your battery life as well
I do this all the time when I use the phone for only phone basics (no data just texting and phone calls) only when I don't know when I will be near a charger again. When I do this I undevolt and under-clock to 600 or 800 and with no data I can usually get about 3 1/2 days, with mostly texting & little to no phone calls.

[Q] Have you managed to OC to 1460MHZ and keep stability?

I'm using AOSP+ ICS ROM with the latest Matr1x kernel. Whenever I try to OC to 1460 the phone freezes and I have to pull the battery, so I'm forced to run at a maximum of 1300MHz.
Also, on a related matter, is it good practice to use SetCPU with various profiles (battery<, temp>, screenoff, charging) for various frequencies? Or should I just use AOSP+ tweaks to chose a min and max frequency and let it be?
Thanks for taking the time to answer these.
Raise all voltages by +30 across the board
Sent from my Nexus S using XDA App
My Phone freezes when i try to OC to 1460
Read the above comment or read my FAQ...god..
Lol
Sent from my Nexus S using XDA App
http://www.youtube.com/watch?v=DPclc3eKgiQ&feature=youtube_gdata_player
Sent from my Nexus S using XDA App
zgomot said:
Also, on a related matter, is it good practice to use SetCPU with various profiles (battery<, temp>, screenoff, charging) for various frequencies? Or should I just use AOSP+ tweaks to chose a min and max frequency and let it be?
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If you are using deep idle you shouldn't underclock since it causes a race-to-idle condition. In other words your battery will drain faster. If you don't use deep idle, feel free to underclock when the screen is off or whatever you want.
sakisds said:
If you are using deep idle you shouldn't underclock since it causes a race-to-idle condition. In other words your battery will drain faster. If you don't use deep idle, feel free to underclock when the screen is off or whatever you want.
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To the point and verry helpful, thanks a bunch
mathkid95 said:
Raise all voltages by +30 across the board
Sent from my Nexus S using XDA App
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Can I do this via AOSP+ tweaks and still use SetCpu to OC and UC? Are they conflicting apps? (Deep idle OFF)
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I would recommend just using setcpu
Sent from my Nexus S using XDA App
mathkid95 said:
Raise all voltages by +30 across the board
Sent from my Nexus S using XDA App
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Just an update, Using CNA 1.4.0 and Matr1x v17, I am stable oc'ed to 1460.
this is what I am running
1)800/1460
2)gov =Ondemand
3)Scheduler =Noop
4)all voltages to +30 (used the cna rom's voltage tweaker)
I tried ShadowGun: the Leftover.. and It was flying. Of course, make sure that have enough battery or that you have a charger ready. But finally it works, try this and let me know
I can run it for 10-20 min of usage then get a freeze. I never raised the voltages before though. It seems like its working for other people. And the actual developer of Matrix Kernel is telling you to ....
Nexus S (GSM i9020a)
AOKP (Build 25)
Eugene's Kernel (Speedy 7)
OC 800/100 (Lionheart)
Live OC (105)
It still amazes me how so many people that ask about overclocking have no frigging idea at all how cpus/gpus in general are binned etc.
I have a question. Why do you guys overclock that much? It might be snappy but battery life is just bad and it just doesn't worth it in my opinion.
Sent from my Nexus S from Tapatalk
albundy2010 said:
It still amazes me how so many people that ask about overclocking have no frigging idea at all how cpus/gpus in general are binned etc.
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Care to shed some light for us people that have no frigging idea at all how cpus/gpus in general are binned etc? If not, well... why did you even bother posting?
ljordan2 said:
I have a question. Why do you guys overclock that much? It might be snappy but battery life is just bad and it just doesn't worth it in my opinion.
Sent from my Nexus S from Tapatalk
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Personally, I do it because I can. Seriously... I'm a geek, I love gadgets and tech and I like to tinker.
On the subject at hand, I'm still unable to OC to 1460 (ARM voltages +30, INT voltages +25) but at 1300 it runs fine, no issues whatsoever.
i can run 1460 stable all day. bigxie/matrix. just did +30 to all the voltages above 1000. deadline and lulzactive..
If you are a geek you would know about something as simple as binning chips. Do what a tech geek would do...look it up. Same thing the op should have done with his ?. Hell mathkid has a answer to his ? In the op of his kernel thread. Which is the kernel he is running
albundy2010 said:
If you are a geek you would know about something as simple as binning chips. Do what a tech geek would do...look it up. Same thing the op should have done with his ?. Hell mathkid has a answer to his ? In the op of his kernel thread. Which is the kernel he is running
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You're kinda bitter for someone married to a busty redhead
jesusice said:
You're kinda bitter for someone married to a busty redhead
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Haha, I thought so too.
Sent from my Nexus S

Battery efficient ROM

Hi, going on a trip soon and need a ROM with good battery effiency. I'm now running InsertCoin Evolution 1.91 and the battery drains pretty quickly so I'm wondering: what's the best ROM regarding battery life time? Sensation XE btw.
Thanks
What kernel do you use?
Try bricked with badass belance, no GPU OC, if you want better battery life underclock to 1GHz it doesnt lag and got pretty decent battery life with it. Dont change screen off freq.
And i recommend you to undervolt, -50v is good, i use about -75 now and its pretty stable.
I used to get more than 20h with 1.56GHz max.
Edit: i use stock z710e battery which is 1520mAh
Sent from my Sensation using Tapatalk 2
Thanks, will try that.
The kernel I'm using atm. is 3.0.30-Bricked.3.0-v1.1-g5a2b328shpå[email protected] ) null
b3ndik said:
Thanks, will try that.
The kernel I'm using atm. is 3.0.30-Bricked.3.0-v1.1-g5a2b328shpå[email protected] ) null
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Use the button mate
Sent from my Sensation using Tapatalk 2
aimcr7 said:
Use the button mate
Sent from my Sensation using Tapatalk 2
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I did it for him since you apparently need the self-satisfaction of internet thank-points.
Does someone mind posting the lowest values u can under volt to?
Sent from my Sensation using XDA
fredcorp6 said:
Does someone mind posting the lowest values u can under volt to?
Sent from my Sensation using XDA
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Depends on the phone. Some can push -75, some only -50. Just gotta try it and see.
sshede said:
Depends on the phone. Some can push -75, some only -50. Just gotta try it and see.
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Tbh i doubt it matters much how much you UV, i'm sure I read an article awhile ago that said uv actually didnt extend battery life at all
sshede said:
I did it for him since you apparently need the self-satisfaction of internet thank-points.
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LoL, no i mean you dont need to say it if there is a button
Thats the point of thanks button
Sent from my Sensation using Tapatalk 2
Jonny said:
Tbh i doubt it matters much how much you UV, i'm sure I read an article awhile ago that said uv actually didnt extend battery life at all
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If you decrease the voltage needed for one freq, it means the cpu needs less power and it means more battery life
Use system tuner pro, its easy and safe
Sent from my Sensation using Tapatalk 2
Jonny said:
Tbh i doubt it matters much how much you UV, i'm sure I read an article awhile ago that said uv actually didnt extend battery life at all
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Well, it technically does, because less voltage means less current, both of those mean less power. (Literally, Current * Voltage = Power, fun fact). However, the increase in battery life is marginal at best, so it doesn't actually benefit.
Power ~ V^2 * f. Voltage has more effect than frequency, both have some effect.
Forget power equations, battery's are capacitors so lets use capacitor equations!
Rate of discharge is proportional to Q/R.
I=V/R so 1/R=I/V
Therefore rate of discharge is proportional to I/V. Ohms law states as one goes up so does the other.
So technically undervolting has no effect?!
Sent from my Sensation using XDA
fredcorp6 said:
So technically undervolting has no effect?!
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Think about that for a minute, if that were the case, why do you think modern processors use lower and lower driving voltages? Your logic is flawed.
"Dynamic frequency scaling by itself is rarely worthwhile as a way to conserve switching power. Saving the most power requires dynamic voltage scaling too, because of the V2 component and the fact that modern CPUs are strongly optimized for low power idle states."
http://en.wikipedia.org/wiki/Dynamic_frequency_scaling
b3ndik said:
Hi, going on a trip soon and need a ROM with good battery effiency. I'm now running InsertCoin Evolution 1.91 and the battery drains pretty quickly so I'm wondering: what's the best ROM regarding battery life time? Sensation XE btw.
Thanks
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Click to collapse
I use this one and its pretty efficient!!
[ROM][JUN.20][ICS][AOKP-CM9]HyperSensation-v2.8
http://forum.xda-developers.com/showthread.php?t=1610209
I've been using paranoidandroid, and some opensensation versions before that, which all suffered from batterydrain. From what i've read that should be fixed now. What i've read is that in theory aosp could be more batteryefficient.
In addition, for aosp, there now is faux, tamcore, and showp's bricked, kernels available.
I used to use virtuous inquisition, its senseless and really great on battery! I think it's been the best battery efficient Rom by far in my opinion. Hope this helps.
Sent from my Sensation 4G using xda premium
Whyzor said:
Think about that for a minute, if that were the case, why do you think modern processors use lower and lower driving voltages? Your logic is flawed.
"Dynamic frequency scaling by itself is rarely worthwhile as a way to conserve switching power. Saving the most power requires dynamic voltage scaling too, because of the V2 component and the fact that modern CPUs are strongly optimized for low power idle states."
http://en.wikipedia.org/wiki/Dynamic_frequency_scaling
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Thanks for that. I was thinking the exact same thing. If everything is proportional, and it is, then decreasing one variable (voltage) should decrease everything else.
I found the virtuous inquisition rom quite good if you ask me but it all depends on your usage as well no one can help if your using your phone like crazy
Swyped From My Sensation.
Is hypersensation and hypernonsense good batt life roms.
Sent from my HTC Sensation 4G using XDA

Best App to disable CPU Cores

hello all
I am trying to find an app that will let me disable the cores that I don't want to use. Can anyone point me in the right direction please?
Tutorial would be great
Sent from my SM-T800 using Tapatalk
Sorry can you please elaborate?
Just use kernel adiutor to disable any of the 4 big cores, or little ones.
Sent from my LG-H950
Ace42 said:
Just use kernel adiutor to disable any of the 4 big cores, or little ones.
Sent from my LG-H950
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thanks, what do you think would be the best combo?
just want my phone cooler and lil longer battery life
SayWhat10 said:
thanks, what do you think would be the best combo?
just want my phone cooler and lil longer battery life
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You would disable 2 big on battery and leave 4 big only while charging. The little cores can all be left on, or maybe leave 3. I haven't noticed a difference between 4 and 2 little cores for battery or temp.
Sent from my LG-H950

Undervolt xperia z5

hi to everyone...i'm just trying to find a kernel for z5 .152 which let me undervolt the smartphone cause i can't undervolt with the original one or with the @AndroPlus kernel..thank you
Why do you want to undervolt?
Sent from my Xperia z5 using Tapatalk
i want to undervolt to improve autonomy and processor life
It might help to increase battery life as well
The amount you can safely undervolt on most devices will achieve you nothing in real life terms. U might achieve a bit cooler running but you're probably talking like 1-2 degrees
Sent from my Xperia z5 using Tapatalk
dylanel98 said:
hi to everyone...i'm just trying to find a kernel for z5 .152 which let me undervolt the smartphone cause i can't undervolt with the original one or with the @AndroPlus kernel..thank you
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AndroPlus kernel works fine with undervolting, I was able to undervolt my Z5 by -300mv on all frequencies
_LLJY said:
AndroPlus kernel works fine with undervolting, I was able to undervolt my Z5 by -300mv on all frequencies
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What tool did you use to undervolt? I tried using device control, but it kept resetting to the default value when I left the menu.
butilities said:
It might help to increase battery life as well
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well, with the current state,
you can only reduce the drain but not stop it (e.g. via http://forum.xda-developers.com/xpe...urance-tweaks-v1-tweaks-t3321841/post65494883 )
that's not an satisfying situation for me,
investigating ...
astarrk said:
What tool did you use to undervolt? I tried using device control, but it kept resetting to the default value when I left the menu.
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i used kernel adiutor from the playstore, works like a charm, my phone does not overheat now
butilities said:
It might help to increase battery life as well
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You'll get about 5 more minutes on the screen over a charge. Not worth the hassle really
Sent from my Xperia Z5 using XDA Labs
Ben36 said:
You'll get about 5 more minutes on the screen over a charge. Not worth the hassle really
Sent from my Xperia Z5 using XDA Labs
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People do it mostly because of heat, not battery.
Ben36 said:
You'll get about 5 more minutes on the screen over a charge. Not worth the hassle really
Sent from my Xperia Z5 using XDA Labs
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It reduces heat on the SoC which can help it last longer
anyone can tell me how to adjust the undervolt on my marshmallow z5?via kernel adiutor5
hadec said:
anyone can tell me how to adjust the undervolt on my marshmallow z5?via kernel adiutor5
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Go to kernel adiutor>cpu voltage and then adjust there, do note that 700mv is the lowest u can go
_LLJY said:
Go to kernel adiutor>cpu voltage and then adjust there, do note that 700mv is the lowest u can go
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would u mind if u could be more specific?
hadec said:
would u mind if u could be more specific?
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Download kernel adiutor, open it, give it root access, then swipe from the left side of the screen to access the options, go to cpu voltage, it will present you with the Little and Big frequencies, tap on any frequency to change its value to your liking and do note that 700mv is the lowest voltage you can set to every frequency.
_LLJY said:
Download kernel adiutor, open it, give it root access, then swipe from the left side of the screen to access the options, go to cpu voltage, it will present you with the Little and Big frequencies, tap on any frequency to change its value to your liking and do note that 700mv is the lowest voltage you can set to every frequency.
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thx much hope it has an impact on battery life

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