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Safe to oc 1500 fulltime?

If I've found a combination of rom/kernal/voltage that's stable for me to run at 1500MHz, is it safe to run that way full-time? I mean, I would still use profiles in setcpu for in-call and screen-off...but would this damage my phone? I do keep the phone in a case, if that has any bearings. I can feel it considerably warmer when I oc it than when I leave it at 1GHz.

what kernel do you use? the new trinity kernel doesnt scale and stays up at 1500 100% of the time, i havent had any problems with heat using 1500 on other kernels, i have a profile to underclcok if over 40C but never kicks in while running faux's kernel and screen off underclock, long term a constant temperature of 40C plus would damage the phone as heat damages any electronics.

I'm running faux's froyo kernal. I have setcpu profiles setup for:
in-call 500/400
screen-off 500/400
and now I just added temp>40c (following your lead) 1000/400
I have 1300mV set for 1500MHz and 950mV set for 1000Mhz...and I believe it's 770 for 400MHz. If I understood Faux correctly, that's already -50 undervolted.
Is there a recommended app for monitoring cpu temp?

just set set cpu notification for your temp profile itll beeep if you go over 40, you could test if you can go an extra -25 it worked on my device any higher it reboots, in my case -25 extra is perfectly stable. i think also , setcpu has a widget you can place on your screen that shows temperature and cpu frequency
if you try to see if your proc can handle an extra -25 i would recomend you take the set at boot option off or you could get stuck in a reboot loop till you restore from clockwork.

400Mhz at -200mV on top of -50mV?

So I'm not sure if this 4th G2x I received is a total beast or SetCPU is just f'ing with me, but I'm cruising at -200mV on top of the already undervolted Faux CM7 kernel.
The phone has absolutely no problems and it just keeps going.
Here's my setup:
1000Mhz Max 950 mV Current 925 mV (-25 mV)
800Mhz Max 850 mV Current 750 mV (-100 mV)
500Mhz Max 800 mV Current 650 mV (-150 mV)
400Mhz Max 770 mV Current 570 mV (-200 mV)
PS: Real men type it out
Edit: Poll added!

GideonX said:
So I'm not sure if this 4th G2x I received is a total beast or SetCPU is just f'ing with me, but I'm cruising at -200mV on top of the already undervolted Faux CM7 kernel.
The phone has absolutely no problems and it just keeps going.
Here's my setup:
1000Mhz Max 950 mV Current 925 mV (-25 mV)
800Mhz Max 850 mV Current 750 mV (-100 mV)
500Mhz Max 800 mV Current 650 mV (-150 mV)
400Mhz Max 770 mV Current 570 mV (-200 mV)
PS: Real men type it out
Click to expand...
Click to collapse
i really wonder sometimes if its really UVing with values so high x_X 216 running at 350mV x_X
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I read in another thread by one of the developers (Faux?) that 770 mV is the lowest allowed voltage due to hardware restrictions and that any settings below that do nothing.

GideonX said:
So I'm not sure if this 4th G2x I received is a total beast or SetCPU is just f'ing with me, but I'm cruising at -200mV on top of the already undervolted Faux CM7 kernel.
The phone has absolutely no problems and it just keeps going.
Here's my setup:
1000Mhz Max 950 mV Current 925 mV (-25 mV)
800Mhz Max 850 mV Current 750 mV (-100 mV)
500Mhz Max 800 mV Current 650 mV (-150 mV)
400Mhz Max 770 mV Current 570 mV (-200 mV)
PS: Real men type it out
Click to expand...
Click to collapse
sincest said:
i really wonder sometimes if its really UVing with values so high x_X 216 running at 350mV x_X
Click to expand...
Click to collapse
You guys have amazing chips
The reason for 770mv @ 389/400 MHz is the limitation of ~100mv per "frequency jump" according to Tegra2 documentation. With the FakeShmoo implementation of overclock, we have a total of 8 slots (frequencies) to play with. If I start the lowest frequency let say at 500mv, then the max voltage at the eighth slot can only be ~1200mv. With 1200mv we can OC to 1.2~1.3 GHz, beyond that then it becomes unstable. So in order to get more juice @ higher clocks, we have to start a higher voltage at the low to get more juice at the high end. Of course, naturally, the next question would be why not start with 1000mv to begin with then you can get 1700mv at eighth slot? If we started with more juice at the low end, it would kill the battery 2x or 3x faster. So the current voltage table you see from my kernels is a compromise between battery life and OC Hope this clears it up a bit.

faux123 said:
You guys have amazing chips
The reason for 770mv @ 389/400 MHz is the limitation of ~100mv per "frequency jump" according to Tegra2 documentation. With the FakeShmoo implementation of overclock, we have a total of 8 slots (frequencies) to play with. If I start the lowest frequency let say at 500mv, then the max voltage at the eighth slot can only be ~1200mv. With 1200mv we can OC to 1.2~1.3 GHz, beyond that then it becomes unstable. So in order to get more juice @ higher clocks, we have to start a higher voltage at the low to get more juice at the high end. Of course, naturally, the next question would be why not start with 1000mv to begin with then you can get 1700mv at eighth slot? If we started with more juice at the low end, it would kill the battery 2x or 3x faster. So the current voltage table you see from my kernels is a compromise between battery life and OC Hope this clears it up a bit.
Click to expand...
Click to collapse
So there really isn't a hardware limit in place on how low this chip can go?
Sent from my HTC Vision (G2x in disguise)

I'm really starting to wonder if setcpu is busting our chops or not I'm
-100mV on all frequencies starting at 594mhz down to 216mhz on morfics jrcu 6/21 kernel, that can't be right can it is there a way to find out for sure???

for frequency 500mhz or 400mhz I can as low as I want ... 10mVs.. even 0mV. so i dont tihnk its accurate

c19932 said:
for frequency 500mhz or 400mhz I can as low as I want ... 10mVs.. even 0mV. so i dont tihnk its accurate
Click to expand...
Click to collapse
do you have any more than 100mV between frequencies?

Black6spdZ said:
do you have any more than 100mV between frequencies?
Click to expand...
Click to collapse
yes I do. should I not exceed 100mV between each frequency level then? would you happen to know the exact biggest voltage difference allowed between each level?
on another note, if I just leave them at 10mV, will that mean the processor will automatically take the voltage down to the lowest possible, or will it just do nothing but run at stock voltage?

c19932 said:
for frequency 500mhz or 400mhz I can as low as I want ... 10mVs.. even 0mV. so i dont tihnk its accurate
Click to expand...
Click to collapse
Yes, it seems possible to make settings that are not logically possible.
It would be nice if either SetCPU (which I am currently using) or Pimp My CPU would display in either real time or histogram what voltages are actually being used in the same way as they show frequency. Although I suspect this may be impossible due to hardware or this would be already implemented.

Added a poll up top.
I made it so you can vote either above or below -50mV. I'm basing this off the OC/UV kernel from Faux123.
I also skipped everything between 1.0 to 1.5Ghz. I'm going to assume at that speed, UV'ing will be very low.

double post

i actually use 1216max and uv it minus 150 all together so fauxs -50 plus i uv it -100, and my phone still flys and battery life is niceeee, oh and for the min i use 389, -200 on top of fauxs -50 so -250 all together

I am OC/UV up to 1200MHz -75mV on all frequencies below the undervolting built into Trinity JRCU kernel. This is stable and further UV gives me trouble. Your assumption about UV at higher frequencies is appears to be incorrect.
The poll actually confuses me, undervolting > -50 could mean I am not undervolting at all since 0 is greater than -50.

Interesting, I can UV more on the lower Mhz than higher. For example, at 1.0Ghz -50mV is already pushing it. Anything higher and I'll notice FC and random closes on certain apps.
First time polling, I guess there's no edit feature to change up the wording. Sigh.

SetCPU doesn't error check so everyone reporting -150mV and greater probably is incorrect. Remember there is only 800mV allowable from the highest frequency and only 100mV allowable between frequencies. So.. take my phone for instance.. I started at the highest 1.5Ghz frequency and tested -25mV at a time until phone rebooted and then went back up 25mV. This just happens to be 1300mV stable for me. This means the lowest 389Mhz can have at the lowest 500mV "1300mV - 800mV". I set everything -50mV across the board and then focused on 503Mhz since no matter what 389Mhz can only be -100mV lower. I was able to get -75Mv "725mV" stable. Then I was able to run 389Mhz stable at -150mV or 620mV. In actuality it is running 625mV since that is 100mV less than the frequency above it... setting it any lower in SetCPU would STILL only be 625mV regardless.
Also, this poll will be useless for everything but the 1500Mhz frequency as we wouldn't know if the user started with the SV or UV kernel. We need multiple polls with the final voltage eg 1100Mhz @ 1000mV,975mV,950mV
Test with a charger plugged in, I've had reboots with a battery at <50% because it cannot supply the high current draw of 100% cpu usage.

My specific settings are as follows as -?? means nothing because different kernels have a different starting point.
1075 mV @ 1200 MHz
975 mV @ 1100 MHz
875 mV @ 1000 MHz
775 mV @ 594 MHz
675 mV @ 432 MHz
575 mV @ 216 MHz
This is solidly stable having run it for several days without any bad behavior although any further reduction of voltage at 1200 MHz causes significant problems.
Phone: G2X
ROM: CyanogenMod 7.1 RC1
Kernel: Trinity 15 jrcu 06212011
Other relevant: SetCPU

I've gotten even better results with the SV kernel. After testing each speed for stability at lower and lower voltages here are my results:
1408Mhz @ 1175mV
1216Mhz @ 1075mV
1100Mhz @ 975mV
1015Mhz @ 900mV
816Mhz @ 800mV
655Mhz @ 725mV
503Mhz @ 650mV
389Mhz @ 595mV
lose 100Mhz from the UV/OC kernel but I get better UV settings with the SV kernel

Black6spdZ said:
I've gotten even better results with the SV kernel. After testing each speed for stability at lower and lower voltages here are my results:
1408Mhz @ 1175mV
1216Mhz @ 1075mV
1100Mhz @ 975mV
1015Mhz @ 900mV
816Mhz @ 800mV
655Mhz @ 725mV
503Mhz @ 650mV
389Mhz @ 595mV
lose 100Mhz from the UV/OC kernel but I get better UV settings with the SV kernel
Click to expand...
Click to collapse
too bad the lowest my phone can go for 1015mhz and 816mhz are 940 and 840mv respectively

Black6spdZ said:
I've gotten even better results with the SV kernel. After testing each speed for stability at lower and lower voltages here are my results:
1408Mhz @ 1175mV
1216Mhz @ 1075mV
1100Mhz @ 975mV
1015Mhz @ 900mV
816Mhz @ 800mV
655Mhz @ 725mV
503Mhz @ 650mV
389Mhz @ 595mV
lose 100Mhz from the UV/OC kernel but I get better UV settings with the SV kernel
Click to expand...
Click to collapse
We seem to be hitting about the same spot, almost exactly, I can OC to 1400 or 1500 but choose not to push my phone to that extent. I live in a very hot area and don't want to tempt fate.

Can we get some info on clocking/volting this phone?

I'm sure I'm not the only person but changing the clock speed/voltages is pretty damned confusing, voltages specifically. I never saw the point to overclocking(not yet at least, nothing really needs it) but lowering the voltages to save battery life is something I'm really into I just don't get how these voltages work at all.
Could someone post a quick walkthrough on it? I don't need your exact settings since I know it varies from person to person but a guide would be nice. I can change the clock speed, it's pretty simple and I used VControl to modify the speeds to 800mhz in both advanced & general but nothing else. Voltages scare me.

Just play around with it. The worst you can do is freeze the phone, nothing a hold of the power + volume up can't fix.
I recommend starting at -25 across the board and increasing slowly until you get a freeze so you can find the best balance between stability and battery savings for your phone.
Sent from my SCH-I510 using Tapatalk

As long as you don't OVERvolt your phone your hardware will be fine, although this isn't an issue since only VControl Extreme overvolts. Worst case scenario: your phone reboots because it doesn't like you taking away its power juice.
On stock clocks (100-1000 mhz) my phone can do -100 mV, anything above that -50. YMMV however, even "identical" processors have different tastes, ie one will take a beating while another is super fragile.
Sent from my Droid Charge running GummyCharged 2.0

How would this work?
800mhz -50v
600mhz -50v
400mhz -75v
200mhz -75v
Would that save more battery or should I reverse the voltages? I don't get how voltages work exactly, that was my main question

blarrick said:
How would this work?
800mhz -50v
600mhz -50v
400mhz -75v
200mhz -75v
Would that save more battery or should I reverse the voltages? I don't get how voltages work exactly, that was my main question
Click to expand...
Click to collapse
-75 means that it takes 75 mv off of the stock voltage setting. That should work, assuming your processor accepts that much under.
Sent from my Droid Charge running GummyCharged 2.0

kvswim said:
-75 means that it takes 75 mv off of the stock voltage setting. That should work, assuming your processor accepts that much under.
Sent from my Droid Charge running GummyCharged 2.0
Click to expand...
Click to collapse
Yeah everything is running fine, quadrant scores of 900 with ext4 begs to differ.. lol. Will overclocking drain more battery? I'd assume it would only affect battery when I'm using an intensive app like the browser that would actually utilize the higher CPU speed.

blarrick said:
Yeah everything is running fine, quadrant scores of 900 with ext4 begs to differ.. lol. Will overclocking drain more battery? I'd assume it would only affect battery when I'm using an intensive app like the browser that would actually utilize the higher CPU speed.
Click to expand...
Click to collapse
It'll stay at the lower settings until an app demands processing power. You will see a slight battery hit but a performance increase.
EDIT: I got 1224 @ 800 mhz.
EDIT: 2100 @1400 mhz. So you can see the performance changes drastically.
Sent from my Droid Charge running GummyCharged 2.0

When on froyo I run this
-25 1200
-50 1000
-50 800
-50 400
-75 200
-75 100

kejar31 said:
When on froyo I run this
-25 1200
-50 1000
-50 800
-50 400
-75 200
-75 100
Click to expand...
Click to collapse
Appreciate all the answers but this was what I really needed, I wasn't sure if I needed to increase or decrease the voltage as the clock speed changed.
Still, thanks to everyone for the information.

1300 - 0 conservative
1000-25
800 - 50
400 - 75
200 -100
100 - 125
Still experimenting. Next charge I will try another governor. Also might try dropping the voltage more on 400 and 800 steps.
Sent from my SCH-I510 using XDA App

PeterGunz said:
1300 - 0 conservative
1000-25
800 - 50
400 - 75
200 -100
100 - 125
Still experimenting. Next charge I will try another governor. Also might try dropping the voltage more on 400 and 800 steps.
Sent from my SCH-I510 using XDA App
Click to expand...
Click to collapse
That's some mega voltage drops for 200-100mhz! I'm assuming that would just save some battery life when your phone is idle because I can't imagine any app only using 100mhz.

I am trying -75 mV across the board on stock voltages. No issues so far. Is there any reason to bump the higher speeds up in voltages? Ran a quadrant and I'm still scoring the same as before undervolting.

quantim0 said:
I am trying -75 mV across the board on stock voltages. No issues so far. Is there any reason to bump the higher speeds up in voltages? Ran a quadrant and I'm still scoring the same as before undervolting.
Click to expand...
Click to collapse
Voltages have nothing to do with performance. It's all about clockspeed.
Sent from my Droid Charge running GummyCharged 2.0

blarrick said:
That's some mega voltage drops for 200-100mhz! I'm assuming that would just save some battery life when your phone is idle because I can't imagine any app only using 100mhz.
Click to expand...
Click to collapse
I am not 100% sure, but I think the bottom steps are similar to PBJ. The only downside I used to get with UV the fascinate that low was that it would either not wake up from sleep sometimes, or calls and texts wouldn't come through unless/until the phone was woken up. Phone doesn't use much power when sleeping, but it is difficult to curb with 4G on.
This phone, in my experience thus far compared to the fascinate, can be OC'd way higher for me and be stable, and can also be undervolted across the board more successfully.
Governors I know nothing about, but have been doing some reading. Still not 100% what each one does. I usually don't OC, but it has been outstanding on this phone thus far.

I use noop and ondemand.
1400 -75
1200 -25
1000 -50
800 -50
400 -50
200 -75
100 -75

hazard209 said:
I use noop and ondemand.
1400 -75
1200 -25
1000 -50
800 -50
400 -50
200 -75
100 -75
Click to expand...
Click to collapse
I literally have no clue what noop/ondemand do, I just left it to ondemand.

hazard209 said:
I use noop and ondemand.
1400 -75
1200 -25
1000 -50
800 -50
400 -50
200 -75
100 -75
Click to expand...
Click to collapse
why didn't you use 1400 1200 1000 800 600 400 200? it looks prettier lol

blarrick said:
I literally have no clue what noop/ondemand do, I just left it to ondemand.
Click to expand...
Click to collapse
noop is the IO scheduler and ondemand is the governor. Imoseyon did some tweaking to ondemand, so that's why I use that versus other governors. I find that noop is more stable for me.
maurogg84 said:
why didn't you use 1400 1200 1000 800 600 400 200? it looks prettier lol
Click to expand...
Click to collapse
It's about stability and what the phone requires of it's resources. Lol. Not OCD perfection.

Can you change the IO scheduler on set CPU? I know you can on voltage control.
Sent from my SCH-I510 using XDA App

kejar31 said:
When on froyo I run this
-25 1200
-50 1000
-50 800
-50 400
-75 200
-75 100
Click to expand...
Click to collapse
^^this but I add the 1400 step at -25 as well... my phone doesn't like being undervolted past -25 on any step above 1000

[Q] [I9020a] Undervolting 100MHz frequency

Hi,
I'm running NSCollab 1.0.50 with franco.kernel from Nov. 13 on a I9020a.
I'm playing around with undervolting the cpu and trying to find the minimum stable voltages. My procedure is to start the voltage as low as the voltage for the frequency step before it and then increase the voltage in 25mV steps until everything is stable. I am using SetCPU to adjust the voltages.
So far this has worked for every frequency step except for the 100MHz step. I can't seem to find the lowest voltage for 100MHz. For example, the 200MHz step will be unstable at 750mV but is stable at 775mV. The 100MHz step is never unstable no matter how low I set the voltage. I can even set it to 0mV (which I know is ridiculous) and it wont freeze.
Does anyone know why the phone doesn't become unstable at ridiculously low voltages for the 100MHz step? I see that the slider to adjust voltages in SetCPU only goes down to 600mV but I can manually type in lower voltage values. Is there some kind of hard-set voltage minimum for the cpu that even SetCPU can't bypass when setting the voltage? Is the phone violating the laws of physics?
Thanks in advance

What's your min frequency in setcpu?

Oh yeah, I should have posted that.
100MHz min
1000MHz max
lazy scaling

i heard that ...
force phone running in low mV MAY damage the CPU and other parts of it and destablize it...
=================================
i have seen some applications that would ignore your input value when it is not logical ...
for example like NS tools , one of them , i don't remember which exactly , perhaps it's live OC, for live OC, if you set value lower then 100 , it would automatically set back to 100 ... i think this may be same as your min frequency case...

nathanson666 said:
Hi,
I'm running NSCollab 1.0.50 with franco.kernel from Nov. 13 on a I9020a.
I'm playing around with undervolting the cpu and trying to find the minimum stable voltages. My procedure is to start the voltage as low as the voltage for the frequency step before it and then increase the voltage in 25mV steps until everything is stable. I am using SetCPU to adjust the voltages.
So far this has worked for every frequency step except for the 100MHz step. I can't seem to find the lowest voltage for 100MHz. For example, the 200MHz step will be unstable at 750mV but is stable at 775mV. The 100MHz step is never unstable no matter how low I set the voltage. I can even set it to 0mV (which I know is ridiculous) and it wont freeze.
Does anyone know why the phone doesn't become unstable at ridiculously low voltages for the 100MHz step? I see that the slider to adjust voltages in SetCPU only goes down to 600mV but I can manually type in lower voltage values. Is there some kind of hard-set voltage minimum for the cpu that even SetCPU can't bypass when setting the voltage? Is the phone violating the laws of physics?
Thanks in advance
Click to expand...
Click to collapse
The method you are using is wrong. I did the same thing a few days ago, and changing the values like that won't work.
What I found out is that to easily find stable values, in SetCPU put your max as 200MHz and your min at 100MHz. Use ondemand. Keep 200MHz at stock volts and 100MHz try an undervolt.
Apply everything then slide the minimum frequency slider around a bit. I guarantee you 600mv will freeze. Do the same for each value, if testing 200MHz, use 400MHz as your max and 200MHz as your min, stock volts for 400MHz. Slide the minimum frequency left and right.
Sounds weird, but it works. Do this until you find a voltage for each frequency. Then put your frequency max and frequency min at the same value (IE 200MHz) and launch a game or a demanding app and play for a lil while, even if performance suck. Hope it doesn't freeze on you, but if it does, bump the voltage a bit.
If you want good starting values, here's the values I have found that work for me and are 100% stable. No force close over the last few days since I started using those:
100MHz 875mv (75mv under stock)
200MHz 875mv (75mv under stock)
400MHz 900mv (150mv under stock)
800MHz 1125mv (75mv under stock)
1000MHz 1225mv (25mv under stock)

[OPTIMIZATION][UNDERVOLTING] Testing different voltages and CPU behavior

I've asked the mods to close my other thread.
What I'll do in this thread is to test kernels and see which will be the best and or the most reliable undervolting parameters.
I know that each CPU/GPU are different, it will be only a reference for what can be done. I'll run extensive tests, stress test and real life test on the Nexus 7 device 32GB.
I'll reserve a couple of post areas because i want it to be a permanant thread and i put my device at risk for you my firends anyway it is not really an issue lol
I'll do the testing like that : ( how i'll do it and conditions )
1. I'll write the kernel name and version i am using for the test
2. I'll post the screenshots of the settings and/or a raw text of the settings for the specific kernel.
3. Trickstermod will be used for tweaking
4. Quadrant test for people who live for it
The conditions for the undervolt pass the test are the following
1. Running glowball for 30 minutes without crashing
2. Running Stability test 2.5 for 30 minutes. ( RUNNING EACH OF THE TESTS FOR 30 MINUTES C-A-D CLASSIC/CPU+GPU/SCALING TEST ) all in userspace mode.
Those settings will be the lower voltage achievable for me. You can use it as a reference but I cannot guarantee it will work for your device.. What I can suggest is using the boot delay option from the trickstermod menu. If we see that some settings are reliable for a lot of people, it would be nice to have help from some coders to write an init.d script with those settings. or just sharing other experiences. This is not a thread where I have the ultimate knowledge, but a thread who everybody can share their experiences, settings and so on to achieve the ultimate goal of performance and very low power consuption and battery life.
Those test will be time consuming but it is ok.
I do not expect any form of donation for that
If it helped you a little bit, you can just hit the help button and it will be my payday =)
Thank you very much
PS : For people giving 1 Star to the thread before I ever post the first undervolting settings, well, I do not know what to say. For the others who already tried the differents settings I,ll post day to day, feel free to post comments and rate the thread. You can even rate it 1 star if you want because you tried it. But for people who gave negatives reviews even if i didn't post any settings, please get a life.

December 4th 2012 6:06PM 1st stable aggressive undervolting
December 4th 2012, 6:06PM
ROM: Scott's CleanRom 3.0
Kernel : 3.1.10-franco.Kernel [email protected] #30
Stability issues : No
CPU frequencies settings : [email protected] Mhz
Governor : On Demand
I/O scheduler : Deadline
Read Ahead buffer : 2048
GPU Max frequency : 526
CPUQuiet Power Management : balanced
VOLTAGE SETTINGS : MPU
1300 Mhz @ 975 mv
1200 Mhz @ 950 mv
1100 Mhz @ 925 mv
1000 Mhz @ 900 mv
900 Mhz @ 875 mv
800 Mhz @ 850 mv
700 Mhz @ 825 mv
600 Mhz @ 800 mv
500 Mhz @ 775 mv
400 Mhz @ 750 mv
300 Mhz @ 725 mv
200 Mhz @ 700 mv
100 Mhz @ 675 mv
Notes for this undervolting
CPU stable at 975 mv for 1300 Mhz. Tried 970 mv with -5 incremental for other frequencies but the device just crashed. reverted back +5mv for all frequencies and run a second test and it was 100% stable.
The stock CPU voltage settings is 1175mv for 1300 Mhz and so on by 5mv incremental. We are able to achieve performance and stability with a global undervoltage of 200 mv. Actually this is a lot. What happened with the battery life ? Almost 8 hours gain vs the stock settings. This is a lot considering there is no drop with performances.
Edit : Just made other extensive testing. Played deadzone, dead trigger and gta 3 without any glitches. They run smoothly without freezes. We could assume this config is quite stable.
Next step would be undervolting bus and memory while trying keeping those voltages for the cpu. Ill need help to achieve that because i am not a big coder.

Ongoing testing ( may not be stable ) Dec 5 2012
ROM: Scott's CleanRom 3.0
Kernel : 3.1.10-franco.Kernel [email protected] #30
VOLTAGE SETTINGS : MPU
1300 Mhz @ 975 mv
1200 Mhz @ 950 mv
1100 Mhz @ 925 mv
1000 Mhz @ 900 mv
900 Mhz @ 875 mv
800 Mhz @ 850 mv
700 Mhz @ 825 mv
600 Mhz @ 800 mv
500 Mhz @ 775 mv
400 Mhz @ 710 mv
300 Mhz @ 640 mv
200 Mhz @ 635 mv
100 Mhz @ 625 mv
With on-demand, the tablet crash.
With interactive and other governors other than on-demand, seems working fine. Needs more testing

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Reserved 3
http://forum.xda-developers.com/showthread.php?t=2009702
He uses my voltage settings as his new kernel base I think. I must verify with him.
Sparksco use 1600 mhz with a ultra low voltage of 1100 mV.
Expect great battery life with his Rom and kernel

Reserved 4
Reserved 4

Reserved 5
Reserved 5

Good job, keep it up Mr. jsmasterx :good:

jsmasterx said:
December 4th 2012, 6:06PM
ROM: Scott's CleanRom 3.0
Kernel : 3.1.10-franco.Kernel [email protected] #30
Stability issues : No
CPU frequencies settings : [email protected] Mhz
Governor : On Demand
I/O scheduler : Deadline
Read Ahead buffer : 2048
GPU Max frequency : 526
CPUQuiet Power Management : balanced
VOLTAGE SETTINGS : MPU
1300 Mhz @ 975 mv
1200 Mhz @ 950 mv
1100 Mhz @ 925 mv
1000 Mhz @ 900 mv
900 Mhz @ 875 mv
800 Mhz @ 850 mv
700 Mhz @ 825 mv
600 Mhz @ 800 mv
500 Mhz @ 775 mv
400 Mhz @ 750 mv
300 Mhz @ 725 mv
200 Mhz @ 700 mv
100 Mhz @ 675 mv
Notes for this undervolting
CPU stable at 975 mv for 1300 Mhz. Tried 970 mv with -5 incremental for other frequencies but the device just crashed. reverted back +5mv for all frequencies and run a second test and it was 100% stable.
The stock CPU voltage settings is 1175mv for 1300 Mhz and so on by 5mv incremental. We are able to achieve performance and stability with a global undervoltage of 200 mv. Actually this is a lot. What happened with the battery life ? Almost 8 hours gain vs the stock settings. This is a lot considering there is no drop with performances.
Edit : Just made other extensive testing. Played deadzone, dead trigger and gta 3 without any glitches. They run smoothly without freezes. We could assume this config is quite stable.
Next step would be undervolting bus and memory while trying keeping those voltages for the cpu. Ill need help to achieve that because i am not a big coder.
Click to expand...
Click to collapse
how is the performance is it good because i have a lot of lag when i pull down the notification bar

sharjackmission said:
how is the performance is it good because i have a lot of lag when i pull down the notification bar
Click to expand...
Click to collapse
Undervolting should not impact the performance of the CPU.
What you can do is taking a look at the numbers and raise voltage a little. But it might be a lot of reasons why it is laggy. Possibly the governor ?
Other people tried the same settings without issues. But raisong the voltage a little wont drain the battery a lot as the number I gave are agressively low.
Cheers

Running on these settings and everything running smoothly. Thanks for the thread.
Sent from my Nexus 7 using Tapatalk 2

Running stock 4.2.1 with MKernel A19 & TRINITY... These voltages seem to be alright.
I am also using interactive and the deadline scheduler.
All is smooth so far... I'll report back if I run into any trouble.
UPDATE - Had to revert. Started getting freezes and crashes.
Trinity kernel's stock voltages seem to play nicely... Anything less is glitchy.

monsieurtalbot said:
Running stock 4.2.1 with MKernel A19 & TRINITY... These voltages seem to be alright.
I am also using interactive and the deadline scheduler.
All is smooth so far... I'll report back if I run into any trouble.
UPDATE - Had to revert. Started getting freezes and crashes.
Trinity kernel's stock voltages seem to play nicely... Anything less is glitchy.
Click to expand...
Click to collapse
For underclocking aaggressively for now I only recommand Franco Kernel. All other kernels Causes stability problems with the same voltages.
Ill let you know soon with that developpement.

Can't wait for m kernel optimizations

krazeecracker said:
Can't wait for m kernel optimizations
Click to expand...
Click to collapse
As soon as they realease the next version I'll test it.
For now the only thing it does is freezing the tablet.
The best undervolting I was able to achieve for now was with Franco Kernel because of the way the kernel is setting up. M-kernel and other boost Bus and memory speed that causes crashes with agressive undervolting.
Doing so, the performance gain is minimal and the battery life truly suffer at the end.
You can get except a few more FPS in certain games but not really noticeable.

jsmasterx said:
As soon as they realease the next version I'll test it.
For now the only thing it does is freezing the tablet.
The best undervolting I was able to achieve for now was with Franco Kernel because of the way the kernel is setting up. M-kernel and other boost Bus and memory speed that causes crashes with agressive undervolting.
Doing so, the performance gain is minimal and the battery life truly suffer at the end.
You can get except a few more FPS in certain games but not really noticeable.
Click to expand...
Click to collapse
No rush man, your work is amazing.

jsmasterx said:
As soon as they realease the next version I'll test it.
For now the only thing it does is freezing the tablet.
The best undervolting I was able to achieve for now was with Franco Kernel because of the way the kernel is setting up. M-kernel and other boost Bus and memory speed that causes crashes with agressive undervolting.
Doing so, the performance gain is minimal and the battery life truly suffer at the end.
You can get except a few more FPS in certain games but not really noticeable.
Click to expand...
Click to collapse
100% of everything you said in that post is untrue. Please make sure the information you pull out of thin air is correct before stating them as fact.
Also voltage tolerance at a certain frequency is device dependent. Not kernel dependent. No amount of circumstantial evidence will change the laws of physics.
One more thing, your frequency table in the first post is wrong. The A9 G core DVFS table does not go below 480MHz. Franco's table is wrong and as a result so is yours.

This thread looks interesting. If you'd like you can test my kernel attached to THIS post as a flashable zip.
:beer:

sparksco said:
This thread looks interesting. If you'd like you can test my kernel attached to THIS post as a flashable zip.
:beer:
Click to expand...
Click to collapse
I will. What would you like me to do after ?
Sent from my Nexus 7 using xda app-developers app

Metallice said:
100% of everything you said in that post is untrue. Please make sure the information you pull out of thin air is correct before stating them as fact.
Also voltage tolerance at a certain frequency is device dependent. Not kernel dependent. No amount of circumstantial evidence will change the laws of physics.
One more thing, your frequency table in the first post is wrong. The A9 G core DVFS table does not go below 480MHz. Franco's table is wrong and as a result so is yours.
Click to expand...
Click to collapse
I did not attack your kernel whats so ever i dont know why you are taking it personal.
As far as i know franco`s table is accurate and the G core can go under 480 mhz. To make sure i what i advance is true i even pluged the N7 to a debug box. My friend who is an analyst programmer certified it also
Sent from my Nexus 7 using xda app-developers app

jsmasterx said:
I will. What would you like me to do after ?
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
Whatever the goal of this thread is I suppose. It's based on bricked kernel but I modified it a lot so it's not really much like it anymore. To some it up it overclocks to 1.6ghz and has quite a few governors. I'm testing smartassv2 right now but I have a feeling it's not good for battery. I haven't really tested many of the other governors but I've never had any of them lock up on me. Voltage control is also supported. No GPU overclocking though.
Sent from my Nexus 7 using Tapatalk 2