Database Develop

UV kernel?

I'm not sure if I actually have it even though I did install it. My battery temp is about 30c and higher. People have been saying they get 24 on the charger. And my battery time is about the same. My about phone says its the UV kernel but how can I really check?

_-..zKiLLA..-_ said:
I'm not sure if I actually have it even though I did install it. My battery temp is about 30c and higher. People have been saying they get 24 on the charger. And my battery time is about the same. My about phone says its the UV kernel but how can I really check?
Click to expand...
Click to collapse
if you don't trust the about screen...
-open up terminal and type cat /proc/version
Try using profiles in setcpu. I keep the frequencies low when charging or when not active (phone is locked, sleeping,etc) which increases battery life and keeps the phone cool.

Check in phone settings (About the phone, or whatever it's called in english) for your kernel version. Yo should see kmobs after cyanogenmod (if you're on cm).

Well i bought setcpu and started using that a little. and the cat version did come back with kmobs so thats good. What do you recommend for profiles?

sleep standby 245/245 on demand
charging 600/245 on demand
power under 10 400/245 on demand

Sweet thanks
btw what is ondemand? compared to the others?

on demand: it only goes to the max clockrate if needed
performance: always on the max clockrate
thats what I figured out.
userspace: i dont really know. I'd like to know if its better to put standby 245/245 userspace instead of ondemand

_-..zKiLLA..-_ said:
Well i bought setcpu and started using that a little.
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Good on you for supporting setcpu! I bet most just pull the latest from here:
http://forum.xda-developers.com/showthread.php?t=505419

Wtf i totally didn't know that. Well payday so i dont mind i guess

Nexus 7 undervolting results - POST HERE

If you have undervolted your Nexus 7 or any other tegra 3 based device please post the results here so I can throw them into a Excel sheet for development.
Using advanced mathematics and complex formulas I will make a undervolted kernel that's stable for everyone. For that, I need ideally 30 results or more. Less is ok but more or equal is better.
FORMAT 1:
CPU
- [FREQ1] [VOLTAGE1]
- [FREQ2] [VOLTAGE2]
- [FREQ3] [VOLTAGE3]
- ,,,
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FORMAT 2:
CPU GLOBAL: [OFFSET]
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I also accept 1 frequency result. You don't have to undervolt everything. I favor the last known voltage that crashes as well if you can send this I am even more happy.

Undervolted mine by 50mv
Sent from my Nexus 7 using Tapatalk 2

djjonastybe said:
If you have undervolted your Nexus 7 or any other tegra 3 based device please post the results here so I can throw them into a Excel sheet for development.
Using advanced mathematics and complex formulas I will make a undervolted kernel that's stable for everyone. For that, I need ideally 30 results or more. Less is ok but more or equal is better.
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Click to collapse
In order to use "advanced mathematics" and "complex formulas".. You might want to provide a format for "the results" you want people to provide.. Without a stream of formatted data to input your "complex formulas" and "advanced mathematics" is impossible..

"Advanced mathematics" and "complex formulas" sounds like you are doing an infomercial.
Pure waffle.
Sent from my GT-I9300 using xda premium

djjonastybe said:
..I will make a undervolted kernel that's stable for everyone
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ha! good luck. considering some devices arent stable at all when undervolted just a tiny bit, and otbers are stable with a lot of undervolting, you have a tough road ahead of you.

simms22 said:
ha! good luck. considering some devices arent stable at all when undervolted just a tiny bit, and otbers are stable with a lot of undervolting, you have a tough road ahead of you.
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I actually came back to post exactly this but Simms22 was too quick, as usual!
Sent from my GT-I9300 using xda premium

nodstuff said:
"Advanced mathematics" and "complex formulas" sounds like you are doing an infomercial.
Pure waffle.
Sent from my GT-I9300 using xda premium
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I see you went with the more direct and honest approach. I tried being more subtle with my response.. :laugh: But yeah.. Marketing hype for a kernel.

styckx said:
I see you went with the more direct and honest approach. I tried being more subtle with my response.. :laugh: But yeah.. Marketing hype for a kernel.
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Might as well be honest, set him on the right track early in his dev career rather than him rely on buzzwords and fud like some people do.
These are forums for android devices, not Apple devices, the reality distortion field doesn't work here, fancy marketing terms should be left at the door.
Sent from my GT-I9300 using xda premium

My Galaxy Nexus is proof of undervolting being unstable using software while being stable with manually programming the voltages. So I am going to give this a good shot anyway.
My Galaxy Nexus uses SmartReflex to undervolt.
Look at this table I made:
https://docs.google.com/spreadsheet/ccc?key=0AuqacKmGLKJ6dEdJZG5QTmNtQnoyYk0zbm5IanluMHc#gid=1
You see the core or gpu was already crashing at 974mV, which was the reason why I stopped undervolting using the thread. But don't give up, I tried again using SmartReflex because I felt I should be able to get lower. And now I am at 911mV but I did not try to get lower yet.
I plan on undervolting by actually programming it. I don't know how you guys undervolt for the Nexus 7, since I am fairly new with this device.
READ FIRST POST for formatting

nodstuff said:
"Advanced mathematics" and "complex formulas" sounds like you are doing an infomercial.
Pure waffle.
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
http://en.wikipedia.org/wiki/Student's_t-distribution
Using that I can calculate which voltage to take that will work for 90% of us or 99% of us or maybe 100% ?
For that I need some results. The more the better.

The only voltage settings that will work for 100% of people are stock voltages.
you will run into endless problems if you release an undervolted kernel because what works for 75% of people won't work for the rest.
If you adjust voltages to include more people the people that can handle the lower voltages aren't getting the full savings their device can handle. Which defeats the point of releasing an undervolted kernel to save battery.
Undervolting should be up to the individual, just release with stock voltages and make a guide showing people how to undervolt.
Sent from my Nexus 7 using xda premium

nodstuff said:
The only voltage settings that will work for 100% of people are stock voltages.
you will run into endless problems if you release an undervolted kernel because what works for 75% of people won't work for the rest.
If you adjust voltages to include more people the people that can handle the lower voltages aren't getting the full savings their device can handle. Which defeats the point of releasing an undervolted kernel to save battery.
Undervolting should be up to the individual, just release with stock voltages and make a guide showing people how to undervolt.
Sent from my Nexus 7 using xda premium
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^^ Truth
I've done a bit of pc overclocking over the years and we'd always seek out the best steppings to find cpu batches that would give a better clock speed for less volts. What would work on one person's cpu wouldn't work on another sometimes even within the same stepping. (My current machine is getting long in the tooth but it's running a 33% OC below stock volts and stable as a rock.)
When the N7 cpu's are tested the stock voltage is the point where 100% of them will run without issue. Certainly there are many, maybe even most N7's that will run undervolted but until you try it you just won't know. Undervolting needs to be done on a case by case basis.

I uv by 100mv on every step on Franco kernel and I've never had a sod or reboot. Maybe you could release different versions like light, medium and heavy to cater to different users that have sets than can uv more or less. To address all these people naysaying I say just go for it, don't let these people dishearten you from what you want to do. I'm sure there will always be users who are willing to try

sorry to break the fun lol
Opened a thread with undervolting settings in different situation. For now i think its the lowest possible

bervin said:
I uv by 100mv on every step on Franco kernel and I've never had a sod or reboot. Maybe you could release different versions like light, medium and heavy to cater to different users that have sets than can uv more or less. To address all these people naysaying I say just go for it, don't let these people dishearten you from what you want to do. I'm sure there will always be users who are willing to try
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Click to collapse
That's exactly the same as what I have done. 100mV right across the board, and I have also never had a reboot or any other negative effect from doing it. Just a bit more battery life.

I too UV 100mv across the board. Never had an issue. And I OC up to 1.6ghz.

phonic said:
I too UV 100mv across the board. Never had an issue. And I OC up to 1.6ghz.
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Same here, no issues with 100mv UV on stock speeds. What would happen if we went too low, would it fail to boot at all or is there some safety mechanism that would allow us to boot into boot loader?

davidoff59 said:
Same here, no issues with 100mv UV on stock speeds. What would happen if we went too low, would it fail to boot at all or is there some safety mechanism that would allow us to boot into boot loader?
Click to expand...
Click to collapse
When either OCing or UVing, you should ALWAYS test out the changes prior to saving them as a persistent boot state. This way, if you set something too high/low and it proves to be unstable, if you restart the device it will revert back to normal.
In the event that you OC/UV too much, yes, you would see signs of instability. In some cases it could show up as soon as you applied to change, in other cases it could take a while to notice. For example, some games or other high processing powered activities could FC/crash. Or your tablet might freeze or reboot. But again, as long as you didn't save your changes as a boot setting, it will be fine once it reboots.
In the event that you did save it, and the settings were unstable for your device, you could boot up into recovery and then manually erase them from taking effect. Recovery doesn't use those settings, as it's technically a different OS. But that can be complicated a process for some. So test test test save. Or don't save and just apply them manually.
Two other points:
Yes, most (all?) devices do have safeguards to protect itself against permanent hardware damage from OC/UVing. If it gets too hot, they will often shut down to protect themselves.
And just because one device can handle being OC'd or UV'd to a certain level doesn't mean they all can. Very minor differences in each component can impact one devices ability from another. The manufacturers only test to see if they can handle the published speeds/etc., but in many cases they can go higher if set to. In others, not so much.

Thanks for that phonic. Given the range of ROMs and kernel's available and the improvements already built in, under volting may not help a lot but every bit helps. Eg this screen on time is pretty good.Close to six hours screen on time with iirc 35% battery remaining.
Paranoid android with motley kernel. I don't over clock the nexus 7 as its fast enough. In fact I under clocked it to 1000 MHz max before and it was still fast but the screenshots are at stock volts and speeds.

it's actually plain simple. If everyone posts results. I can make a kernel with voltages that work for 75% of all people or maybe for 95% of all Nexus 7 owners.
It's called mathematics. But to do that I need as much results as possible.
Easy to do if you know what you are doing, right ?
http://en.wikipedia.org/wiki/Confidence_interval

Nexus 7 Overcloking Heat

Hi guys!!!!!!!!
I want to know, if i want to overclock my nexus 7 what is the max safe temp i can go?

If my fuzzy memory serves me right stock thermal throttling starts at 85c and thermal shutdown at 100c..

Thanks
Thanks but is not what i asked for i asked for the max SAFE temp for the nexus 7 because i want to overclock the device!!!!
But thanks anyway
If someone wants to put their opinion go head that will help me ALOT!!!!!!!!!!!!!

GumarGamer said:
Thanks but is not what i asked for i asked for the max SAFE temp for the nexus 7 because i want to overclock the device!!!!
But thanks anyway
If someone wants to put their opinion go head that will help me ALOT!!!!!!!!!!!!!
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Oh boy.. ..... ... What I gave you is EXACTLY what you asked for. I'm going to suggest you don't overclock because it's apparent you have no idea what you're doing or talking about.

I know what i am doing
I overclocked many devices and computers so i know what i am doing but 85 is not a safe temp so if know the max safe temp tell me if you don't stop insulting me and get a life.

GumarGamer said:
I overclocked many devices and computers so i know what i am doing but 85 is not a safe temp so if know the max safe temp tell me if you don't stop insulting me and get a life.
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Negative bro. Just because you've overclocked "many devices" doesn't mean you know what your talking about. He answered you and your response is get pissed and tell him he's wrong? If you know he's wrong you must know what's right, so why'd you ask!? If the manufacturer sets the the "safe temp" at 85 then yes 85 is safe enough. If you think that's too warm, fine pick a lower temp and go with it.
Sent from my Nexus 7 using xda premium

Sorry
Sorry I overreacted

The question as posed has no answer.
The stock kernel throttles at 95C and shuts down at 100C
Some dev kernels use lower values than this.
The effect of heat is cumulative, and likewise for the number of temperature cycles.
(The point there is that 5 hrs @ 80C could be worse than 1 hr @ 85C)
In general devices that are heavily used experience reliability failures earlier than lightly used devices, whether they are overclocked or not.
Good luck and enjoy your device - while it lasts.

bftb0 said:
The question as posed has no answer.
The stock kernel throttles at 95C and shuts down at 100C
Some dev kernels use lower values than this.
The effect of heat is cumulative, and likewise for the number of temperature cycles.
(The point there is that 5 hrs @ 80C could be worse than 1 hr @ 85C)
In general devices that are heavily used experience reliability failures earlier than lightly used devices, whether they are overclocked or not.
Good luck and enjoy your device - while it lasts.
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Click to collapse
I actually had a post written out going into this perspective also but decided to not even bother. :laugh: Good on ya though for going through with it. Another spin on it is the affect those high temps have on the hardware and chipsets around, or hovering on top of it. This is why I typically don't overclock my devices for anything other than a run through benchmarks. Also, besides using more battery and generating more heat for a longer duration, typical overclocks rarely produce any significant difference the end user can actually notice on these high end devices anyway. Hell, I don't even notice a difference on my single core Nexus S when OCing from 1ghz to 1.4ghz.

[Q] [REQ] Your stable Voltages/Undervolting...

As title says. Anyone who undervolts, what are your stable voltages? For me I've just gone -27 to all.

Lemagex said:
As title says. Anyone who undervolts, what are your stable voltages? For me I've just gone -27 to all.
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-27 what? doent make any sense unless you put what the -27 was. -27mV? undervolting would depend on your bin number, the higher your bin, the more you should be able to undervolt. but i dont undervolt at all, since theres no need. undervolting wont really save you battery. if you have issues with heat, it might make it so its less hot, but thats about it.

simms22 said:
-27 what? doent make any sense unless you put what the -27 was. -27mV? undervolting would depend on your bin number, the higher your bin, the more you should be able to undervolt. but i dont undervolt at all, since theres no need. undervolting wont really save you battery. if you have issues with heat, it might make it so its less hot, but thats about it.
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Binning doesn't really matter. As we have seen in other threads better bins seem to still be limited to undervolting to the same number as lower bins before seeing crashes.
For myself I can run -75 fine, I can game on -60 fine and I can only benchmark on -25.

knitler said:
Binning doesn't really matter. As we have seen in other threads better bins seem to still be limited to undervolting to the same number as lower bins before seeing crashes.
For myself I can run -75 fine, I can game on -60 fine and I can only benchmark on -25.
Click to expand...
Click to collapse
binning does matter, because the starting point will differ, and the amount that can be undervolted will differ. even with that, each phone will differ as well(as some bin 14 wont be able to undervolt as much as other bin 14 for example). but in general, a bin 14 will be able to undervolt much more(on average) than a bin 1.

Good workaround (Kernel/Firmware) against overheating?

Hello guys I got some huge problems here.
I recently switched from my Z2 to the Z3+ and actually like the phone but the overheating is insane and especially kills Pokemon Go through CPU throttling, which runs smoothly on my old Z2 .
So far I am on 253, cleaned it up and tried a self modified and the zach beta9 Kernel and and runs quite bad on both. Is heating a lesser issue of 224? I actually do not want to reflash the whole system to 224 just to find out it doesn't get better.
Also is there a way to undervolt/underclock? I can change settings in Kernel Aduitor but I have the feeling the phone doesn't really care.
Help much appreciated - thanks!

Try Zach beta 8 kernel. Limit max cpu frequency by kernel auditor.
Still it's only your Goodluck if your device cools down. It's a bitter truth about this model.

waseemakhtar said:
Try Zach beta 8 kernel. Limit max cpu frequency by kernel auditor.
Still it's only your Goodluck if your device cools down. It's a bitter truth about this model.
Click to expand...
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Do you have a clue whether 224 or 256 make a difference?
I will try beta8 and report back.

Delvius said:
Do you have a clue whether 224 or 256 make a difference?
I will try beta8 and report back.
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no there was no thermal improvements between these builds, dont flash your system back
but do underclock and tell us the results!
Im also affected by your exact problem

Try this kernel, seems promising. I haven't tried it since it doesnt have twrp.
http://forum.xda-developers.com/xpe...m5z-kernel-t3421630/post67813517#post67813517
Edit: Today I have flashed 256, haven't found any improvement. As per my experience 256 haven't brought any noticable change.

**** posted twice and dont know how to delete

Thank you for the replies!
Tested zach beta8, didn't help. Now I am testing http://forum.xda-developers.com/xperia-z4/orig-development/kernel-om5z-kernel-t3421630/ as suggested and if that doesn't help much also with http://forum.xda-developers.com/xperia-z4/general/kill-overheating-flash-zip-t3421782.
And Stamina Mode helps at least a bit.

Statusreport: It always runs bad. But best at the moment with root patched Stock Kernel (253) and that underclocking zip. Although I think that underclocking doesn't really help at all.

Delvius said:
Statusreport: It always runs bad. But best at the moment with root patched Stock Kernel (253) and that underclocking zip. Although I think that underclocking doesn't really help at all.
Click to expand...
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What are your temps? When does it start to throttle? Done any thermal-conf configuration to allow more heat?
---------- Post added at 21:03 ---------- Previous post was at 20:58 ----------
I know that @Trilliard has a very good and stable cpu governor where he has disabled two of the little and two of the big cores, this helps a lot if you underclock the remaining 4
Here are his files:
http://forum.xda-developers.com/xperia-z4/general/dont-custom-kernels-want-to-avoid-idle-t3409647
UPDATE: Added my edited files used to apply CPU tweaks (cores down clocked to 0.9 and 1.2ghz, two core disabled, tweaked cpu governor, power and others mods) and these files located in etc folder. Replace them and set correct permissions then reboot.
Click to expand...
Click to collapse

bjowol said:
What are your temps? When does it start to throttle? Done any thermal-conf configuration to allow more heat?
---------- Post added at 21:03 ---------- Previous post was at 20:58 ----------
I know that @Trilliard has a very good and stable cpu governor where he has disabled two of the little and two of the big cores, this helps a lot if you underclock the remaining 4
Here are his files:
http://forum.xda-developers.com/xperia-z4/general/dont-custom-kernels-want-to-avoid-idle-t3409647
Click to expand...
Click to collapse
Actually I didn't know about this combination - I will try it thanks!
Do you know about a thermal-conf? Actually never tried one. The phone gets hot indeed but I still think there might be some space before it actually melts.

Delvius said:
Actually I didn't know about this combination - I will try it thanks!
Do you know about a thermal-conf? Actually never tried one. The phone gets hot indeed but I still think there might be some space before it actually melts.
Click to expand...
Click to collapse
Thats what i thought as well i have my own here, its based on another persos post, but i dont remember where...
Anyways, his camera mod worked, but cpu throttle was not tampered with, and it caused a very unbalanced throttling... Ok yay i can use the camera linger and fluently, but when i exit the camera app, i cant use the phone couse its runnig at 348 mhz...
So i i did some modifications to it cpu never get under 840 for little cores, so your phones menues end web browsing are always safe from performance drops.
I made it to be able to play Pokemon go, and achieved a lot better resault than without any changes.. still prefer playing on my shield tablet, but if i dont have it around when theres a lot od pokestops nearby, then this will work for me.
While playing Pokemon go it does not go over 80 degrees, but using snapshat it can get to 85, so dont use snap for to long
Let me know if it worked for you!

bjowol said:
Thats what i thought as well i have my own here, its based on another persos post, but i dont remember where...
Anyways, his camera mod worked, but cpu throttle was not tampered with, and it caused a very unbalanced throttling... Ok yay i can use the camera linger and fluently, but when i exit the camera app, i cant use the phone couse its runnig at 348 mhz...
So i i did some modifications to it cpu never get under 840 for little cores, so your phones menues end web browsing are always safe from performance drops.
I made it to be able to play Pokemon go, and achieved a lot better resault than without any changes.. still prefer playing on my shield tablet, but if i dont have it around when theres a lot od pokestops nearby, then this will work for me.
While playing Pokemon go it does not go over 80 degrees, but using snapshat it can get to 85, so dont use snap for to long
Let me know if it worked for you!
Click to expand...
Click to collapse
Oh nice! Thank you a lot! I will totally try it out directly when PTC comes back alive. X)
What kernel and governors do you use?

Delvius said:
Oh nice! Thank you a lot! I will totally try it out directly when PTC comes back alive. X)
What kernel and governors do you use?
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Click to collapse
Im using stock kernel, may switch to another soon. Im using stock bcause of batterylife and idle power consumption
Im using the governor and cpu modifications in this post ; http://forum.xda-developers.com/xperia-z4/general/dont-custom-kernels-want-to-avoid-idle-t3409647

Hmm. Still runs ****ty.
Can anyone give me a short guide how to edit thermal and governors?
According to my observations the phone gets hot and then cold. I think the throttle is more aggressive and needed and I want to make it less aggressive.

Update:
I made my own modifications to the thermal engine. It is pretty bad for battery I guess but I had a very good expierence playing Pokemon Go with it today. Yes the phone gets hot. Like it doesn't drop below 70°C while playing and regulary hits 80°C but it works good. No dark screen, no 0 CPUs downclocking. So far it's fine for me, maybe I get squeeze even more out of it.

Delvius said:
Update:
I made my own modifications to the thermal engine. It is pretty bad for battery I guess but I had a very good expierence playing Pokemon Go with it today. Yes the phone gets hot. Like it doesn't drop below 70°C while playing and regulary hits 80°C but it works good. No dark screen, no 0 CPUs downclocking. So far it's fine for me, maybe I get squeeze even more out of it.
Click to expand...
Click to collapse
Done any other modifications to your file for a while? Or is it working good for you now? What's your SoT?

bjowol said:
Done any other modifications to your file for a while? Or is it working good for you now? What's your SoT?
Click to expand...
Click to collapse
Still working good for me. Not sure if I can really squeeze out more and as long as it works at the moment I do not have a good motivation to try anything else.
No idea about SoT. Always running around with a powerbank. Probably bad, it is not designed for good battery life.

Delvius said:
Still working good for me. Not sure if I can really squeeze out more and as long as it works at the moment I do not have a good motivation to try anything else.
No idea about SoT. Always running around with a powerbank. Probably bad, it is not designed for good battery life.
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Allright thanks i might try your conf if i cant get mine to work like I want