yashsingh1/xdaforums huggingface dataset:
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Would you kindly please stop ?

If a script breaks charging, causes heat and causes instabilities,

the script has to be adapted.

If the kernel and ROM in its pristine state works stable - that's it,

I cannot account for all kinds of weird and outrageous cases

Can I get some feedback please ?

Overclocking or no overclocking ?

The SoC (processors) should be fast enough, no ?

The past experience has shown that NOT using overclocking makes the phone behavior cooler in total ...
[Xperia Z4/Z3+ Android Development] pou_gh2:
ty for your answering,i underclocked my cpu on 384 i think and it did not work and i turned off 3 cores in one plus 2 they underclocked cpu and they could fix heating but in this device you can not control it i wanted to sell my phone for times but its so beautiful and powerful
[Xperia Z4/Z3+ Android Development] LMcR92:
I don't care much for over clock, usually while using default 1.7 and 2.0 it will throttle easily back to stock. Unless you use a thermal mod but I don't use them anymore one caused me to feel uncomfortable when playing games and another causes slow charging. So I am for stock speeds :good:

My configuration just now is darkness, 1.5 little 1.6 big, GPU msm-adreno-tz 450Mhz, Row 768 and external noop 2048. With init.d scripts ;)
[Xperia Z4/Z3+ Android Development] Kungencortes:
rather underclock , mostly concerned about the heat and battery life
[Xperia Z4/Z3+ Android Development] pou_gh2:
put your little cores on 1.2 and big cores 1.7 with kernel adiutor app and turn off 3 cores and use this https://www.androidfilehost.com/?fid=24591000424960536 and do not use zachs kernel use androplus cause zach does not work with the mod
[Xperia Z4/Z3+ Android Development] pou_gh2:
and i rather underclock too i just want to use this phone with no heating:crying::crying::crying::crying::crying:
[Xperia Z4/Z3+ Android Development] Kungencortes:
andro kernel dosnt work with 253 :/
[Xperia Z4/Z3+ Android Development] davisml:
I just have to add that with this latest update, and Nagasaki ROM 1.5 for the FIRST TIME EVER I like this POS phone. I can actually listen to music through bluetooth without wanting to throw the phone out the window (no hickups, pauses or total freezeup). Also, for the first time since upgrding to Marshmallo my phone continues to charge when restarted while being plugged in. I've made no adjustments, just using it right off the flash (with system SU, systemless Xposed and Substratum.
[Xperia Z4/Z3+ Android Development] Kungencortes:
will you update to 32.2.A.0.305?
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
V1.9.10 works with the lastest firmware
[Xperia Z4/Z3+ Android Development] katabroc:
Zach, I believe that not overclocking works better. I'm using nagasaki's with latest kernel (1.9.10) and everything is running ok.

Will let you know if I see any bugs.

Thank you for your work!!
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Once source is available, yes
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Download

Z4_Z3Plus https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

253_corona_III.1_9_11_ctl_X

253_corona_III.1_9_12_ctl_X
[Xperia Z4/Z3+ Android Development] LMcR92:
Nice downloaded .12 version :good:
[Xperia Z4/Z3+ Android Development] Kungencortes:
awesome
[Xperia Z4/Z3+ Android Development] katabroc:
Which version should we use? .11 or .12?
[Xperia Z4/Z3+ Android Development] LMcR92:
I was using .12 just fine. 12 is just slightly updates. There is a .15 up as well I just installed it.

---------- Post added at 08:01 PM ---------- Previous post was at 07:54 PM ----------

Core control is inaccurate on ka mod, it resets and setting the big options just sets little. Is there a system file that can be changed. Also there is always only one big core on most of the time and it hits 99% load at max frequency without splitting it into two cores.
[Xperia Z4/Z3+ Android Development] pou_gh2:
will you underclock cpu on your kernel?should we waiting to use the phone cool?i(and lot of users) do not care about playing games or anything heavy just want my phone to be cool,ty
[Xperia Z4/Z3+ Android Development] LMcR92:
You keep posting all over these forums. Download kernel auditor mod and underclock from there. The device gets warm naturally no matter what. Its a slim phone sandwiched between 2 glass panels and water and dust tight. You cant undervolt the 810 without knowing exactly what you are doing as Qualcomm have hardcoded vvd. Take a screenshot of your thermal temperatures so that we can see if it's overheating or just warm.

Here is my temperatures as I am typing and just came off YouTube. Its normal to hit high temperatures when gaming blame Qualcomm.
[Xperia Z4/Z3+ Android Development] pou_gh2:
yes i poted things all over the because i paid a lot for this phone,i had brain tumor and i had a surgery after that i bought this phone and i paid my everything for the f...... surgery,so i just wanted to have a phone not well just i wanted it to work my friend,i did not have more money for buying z5 and this phones heating is not a big problem! when it gets hot it begins to Consumption battery a lot more and i need a good battery,ty for your answering and f...qc
[Xperia Z4/Z3+ Android Development] phhuang:
Sorry for your sickness but regarding this ****ty phone everyone here is suffering just as you.
[Xperia Z4/Z3+ Android Development] LMcR92:
After tweaking core control to enable all cores and darkness governor. I have felt a reduction in temperature and increase in battery life and fluidity in my usage. I think this is due to faster race to idle on the big cores and load balancing as usually only one core is holding most of the work load even when above 95% load.
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
How can u enable all cores???
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Via "Core Control" in Kernel Adiutor

raise the

and the

to 4 for both
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Download

Z4_Z3Plus https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

305_corona_III.1_9_12_2_ctl_X

Changes:
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
[MENTION=3037651]zacharias.maladroit[/MENTION]

I did but it get stuck "max" is 4 and "min" is 2.

But only 1 big core enable
[Xperia Z4/Z3+ Android Development] LMcR92:
Change min-cpu to 4

But with the 12.2 I think load balancing is better.
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
Just want to try bro ;)

Changing min_cpus from 1 to 4 can enable all big cores, but when i lock and unlock screen, min_cpus always gets defaut value (1).

Any idea with this??
[Xperia Z4/Z3+ Android Development] _LLJY:
Set this to run on every boot
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Download

Z4_Z3Plus (ivy) https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

305_corona_III.1_9_12_3_2_ctl_X

This is an

EMERGENCY Security Update

Changes:
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
updated Kernel is up !

Please download 305_corona_III.1_9_12_3_2_ctl_X

1_9_14 wasn't able to play e.g. PowerAMP while the screen was off,

IPA isn't really doing what it's supposed to do - focusing doing its job for networks

it also seems to take care for audio - for whatever reason :(

Android is some weird mess
[Xperia Z4/Z3+ Android Development] Uksav:
Thanks, will be testing 305_corona_III.1_9_12_3_2_ctl_X as daily driver, since you're keeping things nicely updated.
[Xperia Z4/Z3+ Android Development] Streetrayzer:
With your latest security update i got back the wakeup issue. Everytime i wake up my device using the power button i have to wait about 5sec to get my screen on.
[Xperia Z4/Z3+ Android Development] LMcR92:
Running 1_9_12_3_2_ctl_X no problem's si fat in my usage and tweaks. Great to see security updates and active development for us z3+ users. I was digging around and seen a new interactive based gov called ironactive "Based on the latest CAF 4.4 version of interactive without any additional modifications. It is found in [MENTION=5899304]Tkkg1994[/MENTION]'s superkernel for the Samsung Galaxy S7." Would this be a viable option?
[Xperia Z4/Z3+ Android Development] LMcR92:
Switched from interactive to darkness and this caused the wake up issue.
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Download

Z4_Z3Plus (ivy) https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

305_corona_III.1_9_12_3_8_ctl_X

This is a Final (for some time), read signature

Changes:

Notice
[Xperia Z4/Z3+ Android Development] LMcR92:
Trying darkness to see if wake up issue is present and using tripindroid I/o. Seems great so far smooth,fast and battery/heat friendly so far. Enjoy your time away and see you in the near future. :highfive:
[Xperia Z4/Z3+ Android Development] bkh_0538:
Hi.....

Sorry for being noob... I am new with Xperia....

Does this kernel contain DRM fixed?

Thanks....
[Xperia Z4/Z3+ Android Development] bkh_0538:
Any suggestion for kernel adiutor setting for balance performance and battery?

Thanks....
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Download

Z4_Z3Plus (ivy) https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

305_corona_III.1_9_12_5_2_ctl_X

253_corona_III.1_9_4_2 ["stable" branch]

This is an interim build which could/should solve several problems

Changes:

Notice

Notes

Kudos

to [MENTION=5627933]androidexpert35[/MENTION] for the heavy testing :)
[Xperia Z4/Z3+ Android Development] LMcR92:
[MENTION=3037651]zacharias.maladroit[/MENTION] Not seeing anything past 30th of October.
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
https://drive.google.com/file/d/0BykGGWB96CBQQkxGTnNCZ2NCMFk/view?usp=sharing
[Xperia Z4/Z3+ Android Development] LMcR92:
Thanks
[Xperia Z4/Z3+ Android Development] ac_arch:
Thanks for all the hard work. Before this kernel, I have a huge problem with SOD or random reboot issue when my E6533 is in deep sleep. I don't have any other apps install as this is not stable for me to use yet. My is stock ROM .305. Reflash clean stock ROM didn't help.

I am on your ...v305_corona_III.1_9_12_5_2_ctl_X_ivy_dual kernel. It did helped reduced random reboots a lot. It was like 1-2 hr. in between and very unpredictable. Upon last night trial, it lasted 9 hrs. I pushed the power button to wake and check, it woke up but after 8-10 secs. before it is hanged. So I hard reset it for reboot. But unfortunately, it didn't leave any "system incident" log in diagnostics section.

Before I used stock kernel, it leaves logs every time it experienced system crash. Just not this. I wish I can help the developer to make it better as well as helping out the hang/reboot issue. Otherwise, this phone is mostly unusable since I like this phone so much.

Any suggestion on how to pull that log and help out this? Thanks.
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
U can use Kernel Adiutor Mod in here

Open app, grant root access, open settings and you'll see it
[Xperia Z4/Z3+ Android Development] LMcR92:
On stock settings in ka all is fine but when I use my usual and favourite governor darkness I get the way up issue again worked on the last 30th October kernel. I like darkness as it's has the performance but is aggressive to low frequency when idle (stopped scrolling,YouTube and messaging) and 5hours SOT. I shall try the other governors and see if the same.

I know features aren't a priority buy maybe trying some newer interactive based one may be useful.

Ironactive

Based on the latest CAF 4.4 version of interactive without any additional modifications. It is found in [MENTION=5899304]Tkkg1994[/MENTION]'s superkernel for the Samsung Galaxy S7.

Lightning

Lightning is modified darkness gov made by [MENTION=5903873]HridayHS[/MENTION]

But I don't know what has happened to darkness as it has worked well for me for a long time.

All my other settings are working perfectly just governor's.

Temperature's,smoothness and speed are up with the safety of the security patches makes this a great kernel with a great developer. :highfive:
[Xperia Z4/Z3+ Android Development] LMcR92:
Going back to 1-9-12-3-8, got good performance and battery. Latest I have get freezing up on general usage and the wake up issue no matter what settings I set both need hard reset.
[Xperia Z4/Z3+ Android Development] RyTekk:
I tried ironactive on Z5, 's worse than interactive backport from 3.18 kernel.
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
Can u share your settings?

I also use 1.19.12.3.8, but it drains many battery when sleep (6 hours = 7%)

Thanks
[Xperia Z4/Z3+ Android Development] Kungencortes:
No matter what we do z3+/z4 suffering from bad battery drain regarding anything, using snapchat watchin short videos, gotta charge 2 times at day atleast
[Xperia Z4/Z3+ Android Development] LMcR92:
Welcome to the Xperia z3+ I range from 3-5.5SOT depending on usage.
[Xperia Z4/Z3+ Android Development] bkh_0538:
Could you help us by sharing your setting profile or setting information?
[Xperia Z4/Z3+ Android Development] ac_arch:
Very nice kernel! I just hope developer can help made/tune a little bit in CPU. I believe the so called SOD or random reboot happened to my phone is due to high CPU power consumption and lack of stable power. Don't know if it is battery or board problem. But after I throttled CPU, it became stable and no random boot. Also less heat and very minimal power consumption.

I tested for a week with .305 original ROM with this kernel as well as Kernel Adiutor. Updated apps as well. So far so good.

I hope permanently set CPU setting in kernel rather than rooting and install KA for possible adjustment. Please anyone inform how to do that. I am not expert on programming if it is too complicated.

Thanks!
[Xperia Z4/Z3+ Android Development] LMcR92:
Anyone else getting wake-up issues when changing governor and under-clocking? All other changes work fine.
[Xperia Z4/Z3+ Android Development] pou_gh2:
for me it works just fine and i have no issue bro
[Xperia Z4/Z3+ Android Development] LMcR92:
Strange I'll do a fresh installation of .305 and try from there. [MENTION=3037651]zacharias.maladroit[/MENTION] is this built into the kernel? https://developer.arm.com/open-source/energy-aware-scheduling
[Xperia Z4/Z3+ Android Development] LMcR92:
Loving maple I/O. Using my favourite benchmark tool pcmark, tests actual usage rather than synthetic loads.
[Xperia Z4/Z3+ Android Development] katabroc:
What are your CPU settings?
[Xperia Z4/Z3+ Android Development] ac_arch:
I put 70-80% of original speed.
[Xperia Z4/Z3+ Android Development] pou_gh2:
is this normal that in 305 three cores are always off!?
[Xperia Z4/Z3+ Android Development] LMcR92:
Yes they will come on when needed. Heavy apps, gaming etc.

Try alucard and under-clock only the big core to 17xxx, use maple I/0, turn down input boost to 960, GPU to 510.
[Xperia Z4/Z3+ Android Development] pou_gh2:
ok ty bro
[Xperia Z4/Z3+ Android Development] bkh_0538:
Thank you for sharing your settings.

Tried it and it is very nice. I applied big core at 18xx and little core at 12xx, responsive and heatless.....

Elementalx is seems to be great also although a bit battery consuming than alucard....
[Xperia Z4/Z3+ Android Development] LMcR92:
Try out darkness too it's my go to choice. Battery is the best on this also less heat as it hovers around 384-900 when you are idle on screen.
[Xperia Z4/Z3+ Android Development] LMcR92:
30 minutes of continuous use using darkness, maple and Big-cores 1.7 Little at 1.5 and GPU at 450.
[Xperia Z4/Z3+ Android Development] _LLJY:
Can EVERYONE please stay at interactive.

It's the most efficient governor period. Alucard and darkness are useless drainers
[Xperia Z4/Z3+ Android Development] Kungencortes:
Agreed.
[Xperia Z4/Z3+ Android Development] pou_gh2:
best result:big cores:864 and little cores:1555 and gpu:450 and governor should be darkness(heating) or interactive(battery) and i/o maple or tripndroid
[Xperia Z4/Z3+ Android Development] RyTekk:
Yup, new changes since 13 if I am right that made interactive to be the most efficient governor, it's even more in my kernel, backport from CAF 3.18 for msm8996 (do request to zach thus he picks them).
[Xperia Z4/Z3+ Android Development] _LLJY:
Little:1248/960 big:1824

Try this and heating will be mostly gone
[Xperia Z4/Z3+ Android Development] pou_gh2:
i tried it,i did not work heavy with my phone yet but with a normal work it reaches 37!
[Xperia Z4/Z3+ Android Development] _LLJY:
37 is normal lol. Anyway try to limit the little cores, they play a big part in heat
[Xperia Z4/Z3+ Android Development] pou_gh2:
i know but when you do nothing and 37,i thought what will happen when i do heavy works.i thought heating happens because of big cores!
[Xperia Z4/Z3+ Android Development] pou_gh2:
what is going on?no new kernel no comment and no activity here!
[Xperia Z4/Z3+ Android Development] toooby:
Yeah, pretty quite here :(

I'm still using this kernel with great pleasure. Although I have some random reboots. But it happens not frequently enough, so I can't see a pattern...
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Short notice

New Kernels are UP ! (5.11_corona_III.1_9_12_7_ctl_X)

full changelog will be posted later

Z4/Z3+ https://drive.google.com/open?id=0BykGGWB96CBQa2xBdHR5TzlrNUE

Z5 compact: https://drive.google.com/open?id=0BykGGWB96CBQVE0tb2dieTZMXzg

Z5P, Z5P dual: https://drive.google.com/open?id=0BykGGWB96CBQaVZTdnF5QnVTMU0

Z5, Z5 dual: https://drive.google.com/open?id=0BykGGWB96CBQQy05VURLbzJTZlU
[Xperia Z4/Z3+ Android Development] bkh_0538:
Hi....

Could not find 12_7 for z4 in the drive.

Have been uploaded?

Thanks.
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Hi yes,

change to list-view and last modified

should show

Z4_Z3Plus_Sunkernel_Permissive_v5.11_corona_III.1_9_12_7_ctl_X_ivy.zip

and Z4_Z3Plus-DSDS_Sunkernel_Permissive_v5.11_corona_III.1_9_12_7_ctl_X_ivy_dual.zip
[Xperia Z4/Z3+ Android Development] bkh_0538:
Still have no luck....

The last modified is 12_5_2 in my trial....
[Xperia Z4/Z3+ Android Development] death_note7:
hope to improve the temperature
[Xperia Z4/Z3+ Android Development] KuroTheBang:
Sorry if that question sounds dumb, but what is DSDS?
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
DSDS = dual sim dual standby

there's also DSDA (dual sim dual active), but those kind of phones are pretty rare:

http://support.sonymobile.com/global-en/xperiaz3/kb/0231018807c614a08013cec540b570055ff/
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
Source:

https://github.com/zachariasmaladro...i_r2/commits/Sun-Kernel_32.2.A.0.224_vI.1_2_9

Download: AndroidFileHost :

SunKernel_for_Z4_Z3Plus 224_I.1_2_9_beta8

Notes:

Please report, if it makes a difference,

Thanks :)
[Xperia Z4/Z3+ Android Development] njaya95:
I need a little advice, can I directly flash this using twrp or do I have to use fastboot?
[Xperia Z4/Z3+ Android Development] death_note7:
twrp is ok
[Xperia Z4/Z3+ Android Development] njaya95:
Did you do it before??? Cause I'm kind of busy and if my phone gets broke, cleaning up is difficult. ;)
[Xperia Z4/Z3+ Android Development] death_note7:
Z4_Z3Plus-DSDS_Sunkernel_Permissive_v224_I.1_2_9_dsds_beta8.zip fixed this problem,because the su is removed in beta8, try beta8 and u can flash supersu freely~now I am using supersu2.76

---------- Post added at 02:52 AM ---------- Previous post was at 02:47 AM ----------

yeah,u can flash this zip,or extract to flash boot.img

,works great with beta 8 for beta 8 can use the laterest supersu~ backup and have a try
[Xperia Z4/Z3+ Android Development] zemetal:
am getting bootloop when i flash boot.img via flashtool, i tried flashing via TRWP also, still bootlooped, i am using E6553 on MM .224. any idea why?
[Xperia Z4/Z3+ Android Development] death_note7:
flash supersu in the sametime
[Xperia Z4/Z3+ Android Development] RenkaHinkaru:
you flash boot.img via TWRP?

You must flash file SunKernel_for_Z4_Z3Plus 224_I.1_2_9_beta8.zip via TWRP;)
[Xperia Z4/Z3+ Android Development] death_note7:
lol，flash boot.img is same.......don’t u know？
[Xperia Z4/Z3+ Android Development] zemetal:
i know all that, i mean that i tried both way i.e flash SunKernel_for_Z4_Z3Plus 224_I.1_2_9_beta8.zip via TWRP--->>got bootloop

then tried, extract boot.img from zip then flash via flashtool, still bootloop :confused:
[Xperia Z4/Z3+ Android Development] :
I tried your new Kernel with beta8 patch and it looks really good. CPU temprature while boot has been greatly reduced, with your first version it went up to nearly 80°C, with the new one it only goes to 60°C which is equal to stock. I will use it for a few days and look how it runs as a daily driver.

Maybe you should mention something for installation on a System which has Systemless root or/and xposed in your OP. If you have systemless root and systemless xposed on your system, you have to flash latest betaSU and latest systemless xposed framework immediatly after flashing a new Kernel. If you dont do this you will get a bootloop.

Edit: The new kernel has an amazing Battery life, i couldnt believe that it could be that great. About 1% idle usage within 3 hours with wifi and everything activated.
[Xperia Z4/Z3+ Android Development] zacharias.maladroit:
okay, I hope I'm permitted to use your statement on the systemless root and systemless xposed in a quote in the kernel post(s),

Thank you :)

Wow, that is half-way unexpected,

great news !

Can you please tell, what ROM, mods, etc. you're using ?

That's actually my main goal in finding the perfect ROM + kernel combination to get superb battery lifetime and ALL features of this phone,

now if I only would get the repacker (beta8) to work on my kernel for the Z5 :confused:
[Xperia Z4/Z3+ Android Development] bjowol:
what kernel, and with what configs are you guys using to manage heat and throtteling?
[Xperia Z4/Z3+ Android Development] njaya95:
I'm having a very peculiar problem, I flashed this kernel yesterday and after that I'm not able to update SU binary in SuperSU, any idea on why this is happening?
[Xperia Z4/Z3+ Android Development] death_note7:
flash the following beta8,it is the laterest
[Xperia Z4/Z3+ Android Development] LMcR92:
Did you get it yet? Single SIM?

Working well here thanks for continuing supporting must be a pain and a stress to complie heaps on kernel's but I'm greatful and I'm sure everyone else is. :highfive:
[Xperia Z4/Z3+ Android Development] bkh_0538:
Yep... still no luck...

Z4 single sim here....

No idea why cant get it...

Any possibility for mega mirror?

Thanks....
[Xperia Z4/Z3+ Android Development] LMcR92:
To help you I will remove it soon in respect to OP.
[Xperia Z4/Z3+ Android Development] bkh_0538:
Thank you very much.

Downloaded completely.

Really appreciate your kind help.
[Xperia Z4/Z3+ Android Development] crestfallen.still96:
Please edit your original post and put this update

I was so disappointed that it didn't have a kernel for the new update, and i found it by chance between the comments
[Xperia Z4/Z3+ Android Development] jekiDlemot:
This is a really great kernel for z3+. Just think if u can add more feature on it. and if u dont mind can u add some of my idea such like:

1. Disable Big cpu if not used(i mean our phone running 1 big cpu all the time for doing nothing) not much powersave but why not?

2. Make the Cpu just run 1 core when no input or i mean touch(I previously have Samsung note 4 and when i no touch it, just 1 core is on in lowest freq) save very much battery when watching film etc. compared to 5 core on, am i wrong?

3. And the last is undervolt, this one is what make my snote 4 heating gone, it is just my thinking that its better than underclock(if im not mistaken i lower it by -25 volt, i ever test my snote 4with -70volt and its still stable no performance lost)

Maybe it is hard for u to make it. I write this cause i want it,and i just cant make a kernel either rom but just a user who can flash awesome developer work. Really appreciate it if u add my idea:angel::good:
[Xperia Z4/Z3+ Android Development] _LLJY:
1. It won't even affect power usage, the 1big core is idling and not consuming much power

2. It will be unstable, anyway having the little cores on won't affect battery life that much.

3. Undervolting is not possible on the snapdragon 810