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Undervolting - I am very confused!

I am on CM7 (n72) with faux's latest 0.2.9 uv kernel, and am undervolted all the way down to 10 mv each on the 389 and 503 frequencies with no performance changes. I have tried setting it with both setcpu and pimpmycpu. I know there can't be a way for my phone to be working at those levels so what am I doing wrong? Am I missing something?
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If you lowered the voltages to -10 then you have not lower to aggressive. If you lower the volts to much device will not boot. I am at -50 across all values. Lower the volts is supposedly to improve battery (life) performance not speed performance.

To be quite honest with the questions the OP is asking he shouldn't be messing with an UV kernel.

Ok, I believe the kernel has a built in minimum mv that it will run at, regardless of how low you set the values in setcpu. Im certain that faux posted what that low value was once when someone else was bragging about undervolting by -250...you aren't really undervolting that low. However, some of our phones cant even handle that minimum low voltage, so consider yourself lucky.
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mmapcpro said:
Ok, I believe the kernel has a built in minimum mv that it will run at, regardless of how low you set the values in setcpu. Im certain that faux posted what that low value was once when someone else was bragging about undervolting by -250...you aren't really undervolting that low. However, some of our phones cant even handle that minimum low voltage, so consider yourself lucky.
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Thank you that's what I was wondering about! Sorry if I didn't phrase my question correctly, I meant the voltages were set at 10 mv, not lowered by 10
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I ran into the same problems. In another thread, faux123 stated that the way tegra works, each adjacent frequency level should only differ by ~ 100mV. so if you started with 1000mhz @ 1000 mV, then the next frequency will be 800mhz @ 900mV (just an example). so pretty much it all depends on how low of a voltage your top frequency can run on. if your voltage difference between 2 adjacent frequencies is larger than ~100mV, then it means nothing.
again, I gathered this info from faux. I have no sold knowledge whatsoever

prettyboy85712 said:
To be quite honest with the questions the OP is asking he shouldn't be messing with an UV kernel.
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We all have to start from somewhere, be nice. It sounded like he misspoke.

How to "use" kernals

edit: yes I know right after I hit the submit thread button I realized I spelled kernel wrong
I just flashed faux's 0.1.2 1.56 GHz NoHz kernel, and everything worked fine. My question is to do with utilizing the kernel for what it can do. I checked my cpu speeds via adb, and the max speed is indeed just stock. Now, I would love to utilize the 1.56 GHz capability of this kernel, but in the first post of his thread faux says not to use any OC apps and I also remember from reading through another thread (I think the Dual-Core support discussion thread) that he doesn't recommend the OC Daemon either. How are people OC'ing if you can't use OC apps or OC Daemon? I vaguely remember seeing a post/thread once that had to do with manually entering clock speeds, but I can't remember where it was. So my question for this part is how can I get the cpu up to speeds I want to like other people are doing (basically, is there a manual way or some other way I don't know about or is everyone just using OC apps/OC Daemon against faux's wishes)?
This part is to do with governors. I can find a wealth of information on what particular governors are designed to do. "This governor is designed to conserve battery when the screen is off" "this governor is designed for maximum performance" yada yada. What i can't find is how you choose which governor your phone uses. I used adb to check available governors and it gives me "ondemand performance". I assume this means that my phone/kernel is currently using that governor. Cool. But how do I switch to a different governor if I want to? It looks like SetCPU allows you to change governors, but is that the only way?
Thank you in advance for your help.

Shouldnt need oc app with his kernels mine is at 1.56 ever since i flashed it.
On demand is the only one that properly works with dual core processor. Even with an oc app you can only select on demand or performance and you wouldnt want to use that governor since it forces the cpu to work at max frequency at all times. To use oc daemon you need the virtous oc scaling files to select frequencies
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hev88 said:
Shouldnt need oc app with his kernels mine is at 1.56 ever since i flashed it.
On demand is the only one that properly works with dual core processor. Even with an oc app you can only select on demand or performance and you wouldnt want to use that governor since it forces the cpu to work at max frequency at all times. To use oc daemon you need the virtous oc scaling files to select frequencies
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Thanks. I'm curious then why faux includes smartass in his thread if on demand is the only one that works properly. I'm also not sure why mine is at stock clock speed, but it definitely is. So is oc daemon the way I should try to bump it up to 1.56?

I believe the smartass governor is supposed to have buipt in profiles like the ones you can make in a app like setCPU. so a cpu tuner would be pointless with the smartass.
And yes i prefer oc daemon to other apps like it. The newest one is like 2.1.3 i think. You are also gonna need the folder "vituous oc" with 6 files governors for screen on and off and min and max frequency. One file for each. Im on ARHD 3.0.4 with 0.1.0 kernal so it already came with the folder in system/etc/virtuous_oc
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Kernal voltages?

I'm sorry for the noob question but I really don't understand voltage terms and what's it for and how it work I was wandering if anyone could explain it to me?
In the past I would use set CPU and create a few profiles and would be done with it but I been reading on the forums about setting voltages higher and lower for better performance.
Currently i'm on eagles blood 2.3.5 ROM, trinity t15 (fun) kernel.
Any help would be much appreciated.
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Don't know what it does don't use it
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ritthyhang said:
I'm sorry for the noob question but I really don't understand voltage terms and what's it for and how it work I was wandering if anyone could explain it to me?
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It's to save power and get better battery life. You lower the amount of power the chip gets at various clockspeeds until it starts not working correctly, then back up to a voltage at which the chip is stable at that clockspeed. Some chips can handle lower voltages than others while still working correctly.
Overclocking = get better performance
Undervolting = get better battery life
Both can lead to phone instability if you set the values to extremes.

Thank you for the info
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lannister80 said:
It's to save power and get better battery life. You lower the amount of power the chip gets at various clockspeeds until it starts not working correctly, then back up to a voltage at which the chip is stable at that clockspeed. Some chips can handle lower voltages than others while still working correctly.
Overclocking = get better performance
Undervolting = get better battery life
Both can lead to phone instability if you set the values to extremes.
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Click to collapse
So lemme ask this how do I undervolt and what voltage is safe to undervolt?
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ritthyhang said:
So lemme ask this how do I undervolt and what voltage is safe to undervolt?
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It all depends on the kernel your using and if it supports UV, it should say if it does in the name of the kernel tho(just look for uv ) Setcpu 2.2.4 will allow you to change voltages only if your kernel/rom support it.
you can safely undervolt -50 -75 at most all the way up to 1.0ghz-1.1ghz i wouldn't undervolt past that.

d12unk13astard said:
It all depends on the kernel your using and if it supports UV, it should say if it does in the name of the kernel tho(just look for uv ) Setcpu 2.2.4 will allow you to change voltages only if your kernel/rom support it.
you can safely undervolt -50 -75 at most all the way up to 1.0ghz-1.1ghz i wouldn't undervolt past that.
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So what your saying is I can use setcpu to change the voltage?I just recently changed kernels I saw that option available but I didn't understand how to use it.under voltages it shows all the GHz underneath it it shows 0.From here what do I do?, do I go too each GHz profile and -50 from all of it?
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Overclocking

Hey guys will overclocking drain the battery quicker even with stock voltages?
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Different voltages are specified as stock for different frequencies. As the frequency changes, the voltage does too. Running 1200mhz with the stock 1000mhz voltage will probably cause instability and crashing.

Harrb, great post.
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And if increase voltage, the power consumption should also increase.

i haven't played with voltages yet but in my experience the benefits of overclocking are minimal anyway, and they make nexus reboot often and other bad things :/

With the right settings you can get a fully stable and functional overclock, but it is on a per-phone basis due to varying quality of the same CPU during manufacture.

Harbb said:
Different voltages are specified as stock for different frequencies. As the frequency changes, the voltage does too. Running 1200mhz with the stock 1000mhz voltage will probably cause instability and crashing.
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Currently I'm using icup kernel speedy 5 clocked at 1.4 and its been extremely stable. So what your saying is that the voltages automatically increase when I select a higher frequency, because I did not change them manually.
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xmatrix13 said:
Currently I'm using icup kernel speedy 5 clocked at 1.4 and its been extremely stable. So what your saying is that the voltages automatically increase when I select a higher frequency, because I did not change them manually.
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Open NSTools and select Voltage tab. That's the list of "stock" voltages for each frequency.

suksit said:
Open NSTools and select Voltage tab. That's the list of "stock" voltages for each frequency.
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Thanks
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A CPU governor such as on demand, lulzactive and lazy tells the CPU what clock to be at and automatically change. While reading, it will be at 100 or 200mhz, while playing a game it will be at the maximum clock you tell it to. Saves power this way.

your asian said:
i haven't played with voltages yet but in my experience the benefits of overclocking are minimal anyway, and they make nexus reboot often and other bad things :/
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yes, usually 1 GHz is enough , UV or OC also may reduce hardware's physical life

Nexus 5 Overclocking

OK, first of all I'd like to apologise for all the questions I keep posting. Im quite a noob with android, and coming from an iPhone, it's been a big leap. I'm just overwhelmed by the android system and how open it is! But I do all this cool stuff to my android like everyone else, although I don't wanna ruin a £350 phone by doing something stupid without guidance! (I'm just a big kid really! ) Which is why I keep posting questions, because it's hard to Google/Search XDA for this stuff...
Whenever I search XDA for 'Nexus 5 Overclocking' all I get is ROM threads, so this will be a thread for everything [under][over]clocking! Share your most effective results, and ask the pros questions!
I'll start it off...
I've Underclocked before, but now I wanna Terry out some heavy emulators (dolphin emulator, Nintendo 64 emulator ect.) But I don't think my phone is powerful enough to run these games full speed underclocked... I want to OVERclock it now, so which apps do I need to achieve this, how do I do it, and what are the most effective values for it?
Thanks,
Pro_Vickers.
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The kernel defines whether or not you can overclock.
There is no real need to in the nexus 5 though.
If it is choppy at 2.3ghz then there is something wrong with the emulator.
In context I play final fantasy 9 on the psx emulator fpse using opengl graphics (which is limited to single core) and still get a constant 60fps
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ProVickers said:
I want to OVERclock it now, so which apps do I need to achieve this, how do I do it, and what are the most effective values for it?
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Hi,
First you need a kernel with overclock (Franciscofranco, Trinity, ElementalX, etc...).
For the apps Franciscofranco have its own app (Francsico Kernel Updater-> FKU) and Trinity kernel also (Trinity Kernel Toolbox-> TKT), all available on the Play Store.
You can use a "generic" app like Trickster Mod, Play store too.
With the apps you choose your max CPU freq and it's done...
For overclocking there is no "most effective value" it depends of the voltage and what your CPU can handle. 2,4/2,5 Ghz seems reasonable (with some kernels you can go above like 2,8 Ghz).
Try a "safe" overclock first like 2,4/2,5 Ghz, and don't set the CPU freq "at boot" to avoid any problem like bootloop in case your CPU can't handle these freqs.
Maybe you'll need to raise a bit the voltage for these CP freqs, it depends of your CPU binning.
You can apply your settings at boot via the app when you are sure that all is stable (so after a few days of test with your use).
In any case you'll need to test in different situations to see if all is fine (hard and normal use)...

Alex240188 said:
The kernel defines whether or not you can overclock.
There is no real need to in the nexus 5 though.
If it is choppy at 2.3ghz then there is something wrong with the emulator.
In context I play final fantasy 9 on the psx emulator fpse using opengl graphics (which is limited to single core) and still get a constant 60fps
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I've Underclocked and it's choppy, but I know it's not the emulators fault because of the reviews, and I've played with it before I Underclocked... The problem is, I forgot how I Underclocked, so can you tell me how I clock it back to stock GHz?
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P.S
I have Franco kernel so clocking shouldn't be a problem should it? Also can I use trickster mod for it? Thanks

viking37 said:
Hi,
First you need a kernel with overclock (Franciscofranco, Trinity, ElementalX, etc...).
For the apps Francisco have its own app (Francsico Kernel Updater-> FKU) and Trinity kernel also (Trinity Kernel Toolbox-> TKT), all available on the Play Store.
You can use a "generic" app like Trickster Mod, Play store too.
For overclocking there is no "most effective value" it depends of the voltage and what your CPU can handle. 2,4/2,5 Ghz seems reasonable (with some kernels you can go above like 2,8 Ghz).
Try a "safe" overclock first like 2,4/2,5 Ghz, and don't set the CPU freq "at boot" to avoid any problem like bootloop in case your CPU can't handle thes freqs.
Maybe you'll need to raise a bit the voltage for these CP freqs.
In any case you'll need to test in different situations to see if all is fine...
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Hi,
I've Undervolted -75, so should overvolt or set it back to stock values so I can safely try out 2.5Ghz?
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ProVickers said:
P.S
I have Franco kernel so clocking shouldn't be a problem should it? Also can I use trickster mod for it? Thanks
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Click to collapse
Re,
Yes you can overclock with Francisco's kernel and yes you can use Trickster mod...
ProVickers said:
Hi,
I've Undervolted -75, so should overvolt or set it back to stock values so I can safely try out 2.5Ghz?
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Click to collapse
Try with your undervolt...
But in first I would try with the original voltage, not necessary overvolting...
Try and see, only you can know if it will be safe or not...

viking37 said:
Re,
Yes you can overclock with Francisco's kernel and yes you can use Trickster mod...
Try with your undervolt...
But in first I would try with the original voltage, not necessary overvolting...
Try and see, only you can know if it will be safe or not...
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All I can see in FKU is Max CPU frequency (960MHz), min (422MHz) and GPU frequency (320MHz) under GPU control... What do I tinker with to get it to 2.4GHz?
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ProVickers said:
All I can see in FKU is Max CPU frequency (960MHz), min (422MHz) and GPU frequency (320MHz) under GPU control... What do I tinker with to get it to 2.4GHz?
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Re,
Max CPU at 960 Mhz
You only see this CPU freq? Maybe your phone is actually to hot and the CPU freq is decreased?
"Click" on Max CPU freq then scroll down to see all the CPU freqs...

viking37 said:
Re,
Max CPU at 960 Mhz
You only see this CPU freq? Maybe your phone is actually to hot and the CPU freq is decreased?
"Click" on Max CPU freq then scroll down to see all the CPU freqs...
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Sorry, I mean that's what it's set at, I can see all of the frequencies, but which ones do I set?
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ProVickers said:
Sorry, I mean that's what it's set at, I can see all of the frequencies, but which ones do I set?
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Ok...
Hum... you choose the one you want, you want to overclock so overclock. The stock CPU freq is 2,26 Ghz so if you go above this freq you overclock...
Maybe it's why "But I don't think my phone is powerful enough to run these games", like you said, if your max CPU freq was at 960 Mhz...?

Default the stock max freq will be 2260 MHz or 2.26ghz depending on how it's displayed.
I'd leave your undervolt as it is for now and just increase the max frequency and see if it becomes smooth for what you need
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viking37 said:
Ok...
Hum... you choose the one you want, you want to overclock so overclock. The stock CPU freq is 2,26 Ghz so if you go above this freq you overclock...
Maybe it's why "But I don't think my phone is powerful enough to run these games", like you said, if your max CPU freq was at 960 Mhz...?
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Click to collapse
Alex240188 said:
Default the stock max freq will be 2260 MHz or 2.26ghz depending on how it's displayed.
I'd leave your undervolt as it is for now and just increase the max frequency and see if it becomes smooth for what you need
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I know that my phone is fast enough (obviously, it's a nexus 5 beast!), and I know that I lowered my CPU frequencies, but it's just that I forgot what the defaults were, and how to change it. I know now, thanks you guys! P.S should I change my min frequency or is that fine?
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ProVickers said:
I know that my phone is fast enough (obviously, it's a nexus 5 beast!), and I know that I lowered my CPU frequencies, but it's just that I forgot what the defaults were, and how to change it. I know now, thanks you guys! P.S should I change my min frequency or is that fine?
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Ah ok, you should have explained it at the beginning... , you're welcome
Stock min CPU freq is 300 Mhz..., not sure you'll see any gain to set it to 422 Mhz...
Set it again at 300 Mhz and see...
In any case if sometimes you have a doubt about some stock settings, disable the set on boot option and reboot, all the stocks settings will go back. Or in FKU, App settings then clear data for FKU.