yashsingh1/xdaforums huggingface dataset:
[Nexus 5 General] rydako:
Damn looks like I'm one of the few who can't get this command to work - tried a few times yesterday and tried another few times today (With reboots in between tries) and still can't get the command to run.

So far I've only undervolted 300mhz, I'm at 700mV and a few days of testing has shown no signs of instability. Sadly it wont boot below 700 though.

I'm running Stock rom, rooted with Elementalx kernel.

Edit:

Hah finally got a result

I'm PVS 1
[Nexus 5 General] howard bamber:
Got nothing with the given command. Look at both

As you will see left out the l

Second shows PVS1 there was tons of stuff of interest but it's like 10 photos worth. Try using the command I did if you got nothing
[Nexus 5 General] matteventu:
Guys, I have tho Nexus 5s and when I type the command, they give me a different answer...

first: http://i.imgur.com/44OGhBZ.png

second: http://i.imgur.com/1zEipHc.png

What does mean the first?

And why the second does not show me anything? :confused:
[Nexus 5 General] MLopez14:
PVS 4 here

Enviado desde mi Nexus 5 mediante Tapatalk
[Nexus 5 General] matteventu:
Any help? ^_^
[Nexus 5 General] Searz:
My first Nexus 5 had a bin of 2, my second one (replacement cuz crooked accelerometer and rattling power button) had a bin of 3.

I'm very happy I decided to replace it. The new device is great, it has a bit of a yellow tint to the screen(the old one had a blue-green-ish tint), but I don't care since the device exterior is perfect; I got larger speaker holes and the camera fits better with the plastic back this time, on the previous one it creaked when I pressed down on one spot. Not to mention the now firm power button(and working accelerometer).

I also thought it drained battery much slower, but then I realized that it was because it had no SIM in it :silly:

Not sure about the second, but try to check right after you've restarted it and see if that gives a result.

The first one seems to have a bin of 3, which is average. Right in the middle.
[Nexus 5 General] drsn0w:
PVS1 :/
[Nexus 5 General] Juzman:
SPEED BIN: 1

ACPU PVS: 1

CPU Frequencies Supported: 21

franco.Kernel

This is my current voltages that are stable. Haven't tested any lower.

Freq | St V | Un V
---------------------------
300 | 800 | 675 = -125mV
345 | 800 | 700 = -100mV
422 | 800 | 700 = -100mV
652 | 810 | 735 = -75mV
729 | 820 | 745 = -75mV
883 | 840 | 790 = -50mV
960 | 850 | 800 = -50mV
1036 | 860 | 810 = -50mV
1190 | 885 | 835 = -50mV
1267 | 895 | 845 = -50mV
1497 | 930 | 880 = -50mV
1574 | 945 | 895 = -50mV
1728 | 975 | 925 = -50mV
1958 | 1020 | 970 = -50mV
2265 | 1075 | 1025 = -50mV
2419 | 1090 | 1040 = -50mV
2572 | 1105 | 1055 = -50mV
2726 | 1120 | 1070 = -50mV
2803 | 1150 | 1100 = -50mV
2880 | 1175 | 1125 = -50mV
3014 | 1200 | 1150 = -50mV
[Nexus 5 General] Hemotherapy:
PVS 2 :3
[Nexus 5 General] docck:
PVS 2
[Nexus 5 General] vrda08:
Pvs 1

With franco kernel i can uv bellow 700mv

300mhz@675

On other kernels i can NOT get bellow 700?

What this means about kernel relationship with binning?

Edit:

Holly f*** i can get even 650!!!

Edit 2:

625 for pvs1? Default is 800.

PVS1

-175mv UV [MENTION=409989]300[/MENTION]

Amazing kernel by franco.
[Nexus 5 General] walpurgisnacht30:
PVS 6 lol
[Nexus 5 General] LaboDJ:
It's actually a PVS 1... Next time pay attention :cyclops:
[Nexus 5 General] walpurgisnacht30:
Lol yes, just realized that ???
[Nexus 5 General] rumpleforeskin:
RMA'd my N5 due to a screen issue.

Went from a PVS 4 to a PVS 1

The PVS 4 had lower voltage for every frequency setting before any undervolting and would accept -100 global

The PVS 1 has much higher initial voltage before undervolting and will only accept -50 global, which does not even bring it down to the original voltage of the PVS 4.

Think I'll have to spend some time to fine tune each frequency now :(

The new device runs noticeably hotter in use.... I weep for my lost battery life and more frequent thermal throttling.
[Nexus 5 General] vrda08:
For my with pvs1 and franco r55 can get 100+ UV, even 175mv UV for 300Mhz
[Nexus 5 General] gamer.11:
PVS 2 so how can can i go with the voltages? +/-50 or +/-100.

how much has anyone (how has PVS 2) gone under or over with the voltages?
[Nexus 5 General] JTAllum:
Mayyyyyn [emoji28][emoji24]
[Nexus 5 General] howie87:
Dayum

PVS 0 here and one stuck pixel. Think I got luckier with my 2013 Nexus 7.
[Nexus 5 General] moxlon69:
the whole concept of binning makes perfect sense to me, but I never even thought about it.. Came across the thread by chance looking into something else. That said, I tested the two nexus 5's in my house, and both reported PVS 2.. I'm going to assume that this (or rather, the voltages that my SoC can run stable at) would be the reason that the Furnace kernel causes my phone to reboot. I haven't tested this theory on the other nexus 5, and I never checked to see if the Furnace kernel uses higher/lower default voltages or higher clock speeds on the CPU/GPU, so I'm just guessing.. but it sounded good to me..

I've never really had the time to do a lot of testing, but it'd be interesting to see a table with the PVS numbers, and the optimal voltages/frequencies that these chips run at. If things calm down at work, I might just try it out.
[Nexus 5 General] zibiksior:
Guys when I input dmesg | grep PVS I get no output from terminal just new line. Im on 4.4.4 can it be possible that this command stopped working? It was workig for me on 4.4.2 and now its not... I already know my pvs but my friend wants to check it out and its not working for him too. What can I do to make it work?
[Nexus 5 General] and313:
I can also confirm the same thing. Does not work on 4.4.4
[Nexus 5 General] carbon14c:
works fine for me, on 4.4.4...
[Nexus 5 General] Ririshi:
I'm on stock 4.4.4 on my N5. Install terminal > reboot did it for me.
[Nexus 5 General] and313:
Hm im on aicp... And after a reboot it still doesnt... Who knows
[Nexus 5 General] scottx .:
Mines 4.

My nexus 4 was 'fast'.
[Nexus 5 General] BennyJr:
Mine is 1. Hold me :(
[Nexus 5 General] rohit25:
For all those reporting that dmesg | grep PVS doesn't work....

Please reboot your device once.....

This is because when you install term and enter su... For some reason it doesn't get the values ...

Hence reboot and you should be able to see the value.....

Sent from Dilli
[Nexus 5 General] xXDanielHDXx:
i got PVS 3 and 0.331 :D do you think elementalx kernel boosts it somehow (no oc)? :laugh:
[Nexus 5 General] joecool666:
i got pvs 0 , but my device is very snappy and i get antutu bench 30k plus, so what does this mean, is it good or bad any help would be grateful, thanks,joe

nexus 5 16gb
[Nexus 5 General] kilowatt95:
Can UV down to -75 mV, and device is still pretty snappy with 33k-35k AnTutu scores (though i did go up to 36.1k once!)
[Nexus 5 General] and313:
Finally it worked... Got a pvs of 2... It underclocks to -50mv and runs at 2.5... Havent tried it higher for now
[Nexus 5 General] RussianBear:
Nah, that time doesn't mean anything. Just shows when the info was written down.
[Nexus 5 General] topgeardave:
Does anyone have the link for the stock voltage tables for each pvs? I can't seem to find it
[Nexus 5 General] drawde40599:
my RMA is PVS 1 and my old one was 4 . this #1 runs cooler and battery lasts longer , noticeably longer . I don't UV
[Nexus 5 General] s00000000000ka:
2° Nexus

PVS 0

L O L
[Nexus 5 General] DanCapoDaDon:
This is what I got on my 16g blakc n5
[Nexus 5 General] cubskru:
Pvs 0 but consistently get between 37 and 39K on Antutu with stock kernel. Is there a consensus that lower is worse in all ways?
[Nexus 5 General] joecool666:
i have the same pvs 0 and i get 42 -43k, and on a bad day i get 39k, so it's not a bad thing i think, kind regard's joe
[Nexus 5 General] mithab:
PVS 2 here too!
[Nexus 5 General] SoftWord:
Hi all, I have PVS and BIN = 1, how can I found for every mhz the right voltage?
[Nexus 5 General] joegestes:
PVS 3 :good:
[Nexus 5 General] msnnsm:
anyone knows how it works on lollipop ?
[Nexus 5 General] opssemnik:
this basicly searches the output of the kernel log, as long they don´t remove this from the kernel (which i doubt, since qcom uses to set some things per PVS)yes, will work on any system running a kernel based hh-msm one

---------- Post added at 08:50 PM ---------- Previous post was at 08:48 PM ----------

https://android.googlesource.com/ke...op-release/arch/arm/mach-msm/acpuclock-8974.c
[Nexus 5 General] PellefanT-:
I got PVS: 0 :(

So, can somebody explain me how to get right voltages to each frequency?
[Nexus 5 General] mnomaanw:
Can you tell exactly where to look for the voltages?

Edit: ok I think I understood it. Is it the one where for PVS 6 its 750000 for 300MHz and 950000 for 2265Mhz?

But arent they the default values that automatically gets applied on phones?

Mine is PVS 3 and at 300Mhz it can go to 650000 and at 2265MHz it is 950000 (I havent tried going any lower).

So am I safe or should I increase the voltage?
[Nexus 5 General] rpagala:
I got PVS 1, 0.536339
[Nexus 5 General] aeppacher:
B-b-but did I win?
[Nexus 5 General] nitrogen618:
Man.. Bad luck. PVS 2 :(

Wish I could have a 4.
[Nexus 5 General] ihatelolcats:
PVS 4
[Nexus 5 General] bloot:
PVS 1 here.
[Nexus 5 General] jphilippon:
PVS 2

.459

sent from my Nexus 5
[Nexus 5 General] aaronc_98:
PVS 2
[Nexus 5 General] sishgupta:
PVS 3
[Nexus 5 General] g2tl:
PVS 4

http://forum.beyond3d.com/showpost.php?p=1727961&postcount=391
[Nexus 5 General] deansaunders:
Erm.......PVS 0 :eek:
[Nexus 5 General] itsfozzy:
PVS 4

Moved up one from my Nexus 4 :highfive:
[Nexus 5 General] Revthejedi:
PVS 2

I tried a global UV of 75 and my phone crashed and rebooted. I'd like more UV capability but not a biggie for me.
[Nexus 5 General] Jur1nator:
PVS 4.. Again like my n4 a lucky bin :)
[Nexus 5 General] Apolyxon:
Slower than slow, mate?
[Nexus 5 General] itsfozzy:
You're going to struggle to run Gingerbread on that baby!
[Nexus 5 General] dweekie:
How do we know if 0 or 5 is better?
[Nexus 5 General] The Gingerbread Man:
I got a 3
[Nexus 5 General] dnalevelc:
I got a PVS 3
[Nexus 5 General] cutterjohn:
Anyways. Semiconductor(including CPUs, even when they use a 3rd party, e.g. TSMC or Global Foundries or IBM or Intel or etc. ad nauseum) produce CPUs that work withing in designed specs, say 5V/2.3GHz with expected thermal dissipation(heat)/etc.

Now sometimes you get some "better" parts that oh say, can run(exaggeration ahead, a little) 4.9V/2.5GHz with about the same otherwise characteristics(maybe even less heat dissipation) than the supposed design target chips... (get binned as a "better" part... see nvidia below)

Then we now also have the defect chips that won't work at all at 2.3GHz unless we supply them with say 5.2V, and also produce a great deal more heat at those values. (Or it may be that if it were an 8 core CPU design that only 4 or 6 of them work at designed voltage/temp/etc. so they get "binned" as a cheaper part... AMD has to do this alot as Global Foundries is pretty well crap as foundry, Intel almost never does this, and well TSMC as a contract foundry with no designs of their own just doesn't care other than they make a good enough product to make a profit(oversimplification, but you get the idea, the wheels don't fall off, they're happy, you gett a ferrari, great, etc.)...)

i.e. it's cherry picking the middle of the above, just the same way that nvidia is cherry picking their gk110bs for the 780 Ti. [EDIT] So they really want to overclock their SD 800s in the n5 which I don't think is gonna work all that well given that thermal(heat) dissipation is crap...
[Nexus 5 General] Cheater912:
PVS 1. Bleh

Sent from my Nexus 7
[Nexus 5 General] opssemnik:
yes, but the default values aways will be a bit higher since even if you have the same pvs, your processor may not support X clock rate.

and you are always safe to go lower untill the system glitches out, random reboots, or artifacts on the screen, etc ...
[Nexus 5 General] zerosum0:
There you go. Not that it makes a lot of difference. I still beat the s5 on antutu)

Sent from my Nexus 5
[Nexus 5 General] nedooo:
They are right as they are...
[Nexus 5 General] deepray:
I never get anything after writing these commands. I give terminal emulator the root access using su and then type dmesg | grep PVS.

Nothing. I get the root prompt back. Where I am going wrong.
[Nexus 5 General] PellefanT-:
Have you restarted device after installing terminal emulator?
[Nexus 5 General] deepray:
Yes sir multiple times. Is there something like a particular app will give results while some other won't ?
[Nexus 5 General] veldom:
Try to temporarely disable any app that modifies kernel settings at boot.

Then reboot and try again.
[Nexus 5 General] deepray:
PVS 3.

Thank you Veldom, I got PVS 3 after disabling Franco Kernel at boot. Now help me understand upto how much i can undervolt.

Second thing, why won't a command give results if the kernel is being modified at boot time. What has this got to do with a command on CPU parameters ?
[Nexus 5 General] veldom:
I'm not an expert, but:

1. With PSV 3 you can esily undervolt to 100mv (maybe more). The only way is to try: start from 50mV, then step down by 10mV at time and test your device every time. When you reach the limit your device will freeze/reboot. While testing you should not apply this changes on boot with Franco Kernel Setup of course.

2. Probably, setting new kernel settings erases the kernel log, so you lose the PVS line.
[Nexus 5 General] deepray:
Thanks a lot sir for the info. I will keep it in mind.
[Nexus 5 General] _Vegas:
Edited

来自我的 Nexus 5 上的 Tapatalk
[Nexus 5 General] Amaranth`:
Guys the PVS is static for every phone model? or exist any way to change it? to increase the level more than i have.
[Nexus 5 General] aavvaallooss:
It is static. It´s about how the CPU was manufactured (Hardware)
[Nexus 5 General] Amaranth`:
is sure for that? because with my friend i have same model phone, same gb, same rom, same kernel, same kernel settings. But my friends its pvs9-bin1 and my is pvs6-bin1. And all its same. It surprises me. Anyway
[Nexus 5 General] aavvaallooss:
http://androidcreations.weebly.com/cpu-binning-explained.html
[Nexus 5 General] Nick80835:
Do i get cake now?
[Nexus 5 General] phenoxis:
Are higher bins really better?

I had the opportunity to run some experiments on different Nexus 5 phones.

I was fortunate to find a phone from each bins 0 to 4.

I ran a simple program to compute the first n digits of pi and have attached the results.

The workload was fixed on all phones. Each phone had to complete 800,000 iterations of computing pi digits.

The source code for pi was adopted from here: crypto.stanford.edu/pbc/notes/pi/code.html.

My consensus from reading a few posts was that higher CPU bins are superior, but in my experiments, the higher bins performed worse.

Is this expected? Are higher bins expected to perform worse under heavy load?

PS: I don't have privileges to post links/images. I'm attempting to add them in nonetheless.

Results: drive.google.com/open?id=0B6MRb1B38aVmWUxMR0cwbjl5ckk
[Nexus 5 General] phenoxis:
App to detect CPU quality and bin

Just to follow up on my earlier post, we've developed an app that should help identify CPU bin differences.

The app will inform you of your CPU bin if your device is rooted, otherwise, it runs a 'benchmark' to detect how good/bad your CPU is relative to other user's devices.

One of the biggest problems with benchmarks is that they don't account for temperature; both CPU and ambient. A good CPU running at room temperature can never match up to a bad CPU running inside, say, a refrigerator. Thus, benchmark results are skewed in favor of those that ran at lower ambient temperatures.

Our app is designed to account for both CPU temperature and ambient temperature. Comparisons between the results of your phone and others of the same make & model are further filtered based on temperature.

In other words, if you ran an experiment in a very cold environment, your results are compared against other iterations that ran under similar conditions.

We've had good success in identifying the quality of CPUs on the Nexus 5 and Nexus 6. We're trying to get the word out and collect data from a larger set of devices. Do note that the app is experimental and may have a few bugs. However, I'm actively working on improving it to providing better and more accurate results. Our end goal is to be able to allow users to run our app and get to know the quality of their smartphone before they buy it.

The app is available for Android on the PlayStore at:

play.google.com/store/apps/details?id=edu.buffalo.cse.phonelab.smartphonesexposed
[Nexus 5 General] muyoso:
Got a PVS of 4. Can't wait to begin the undervolting.
[Nexus 5 General] Warrimonk:
PVS 2 :( I max undervolt at -100mv. Any less is unstable
[Nexus 5 General] Stories:
PVS 2. Oh well.
[Nexus 5 General] Old-school:
Me too. The main reason I ordered the 32gig was because I thought the chances of it being a better binned CPU was higher. Well at least mine is perfect (at least to me): no rattling buttons, no screen bleed, and I am happy with the camera. Probably just gonna try to stick with stock as long as I can. And before the flaming begins, yeah I know this isn't everything and I am pretty satisfied with how fluid everything is.
[Nexus 5 General] nitrogen618:
What kernel u guys using?
[Nexus 5 General] big_b0sss:
sh1t pvs 2 :'(
[Nexus 5 General] Cheater912:
Does having PVS 1 mean anything if I have no interest in over/underclocking?

Sent from my Nexus 7
[Nexus 5 General] Warrimonk:
Yeah same. I am defect free besides a little play in the power button and the idea of trying to get a better binned CPU while giving up an otherwise perfect phone seems too risky.

I am curious to see how much the other bins can undervolt.
[Nexus 5 General] dnlsmy:
Alternatively, you guys should also run

dmesg | grep acpuclk

because it will give you a Speed Bin along with the PVS and CPU frequencies as well. I ran it in recovery with TWRP (I don't want to root my phone) and I got a Speed Bin of 1 and a PVS of 1 with 14 frequencies supported. I think frequencies will be the same for all, but Speed should match with PVS. Also, higher numbers are better if Qualcomm is following their Snapdragon S4/600 scheme.

From HTC One Thread
[Nexus 5 General] Duplicated:
What if your speed bin doesn't match your PVS?

Mine says speed bin is 1, but PVS is 3
[Nexus 5 General] RussianBear:
I was about to post a link from that thread also :)

Nothing at this point. Mine is BIN 1 and PVS 5.
[Nexus 5 General] kaywalker23:
So for the more experienced users can you comment on how much actual battery life can be saved in a PVS1 vs PVS5 device with undervolting? obviously I'm looking for a theoretical answer.
[Nexus 5 General] dnlsmy:
Sorry, I reread the source thread. All S600 are Speed 1 and S4 are Speed 0. I think all S800 are also Speed 1 in this case. PVS is the only binning I guess.
[Nexus 5 General] jdh10475:
Pvs 3 @ .909
[Nexus 5 General] RussianBear:
We don't have any UV capabilities yet, as far as i know. Wait for some custom kernels to come out (when the devs actually get their phones). People get too hung up on little crap like this. I've used uv before and haven't noticed anything on N4 (uv'ed by over 100mV on various frequencies at times).
[Nexus 5 General] Zainiak:
PVS 2 but who really cares...
[Nexus 5 General] notbrodie:
do you need to be in a specific directory? I've run the command multiple times and it returns nothing

Sent from my Nexus 5
[Nexus 5 General] RussianBear:
did you try restarting the phone? it needs to query the "last_kmesg" in /proc folder.

You can manually open that file up (if you have one) and look for PVS stuff in it.
[Nexus 5 General] notbrodie:
from another thread, if you navigate to /d/acpuclk, there's PVS_bin and SPEED_bin files.

according to those, I'm PVS 3 and speed 1

Sent from my Nexus 5
[Nexus 5 General] gee one:
I think the dmesg output only had the last 5 mins or something. A fresh reboot should re-populate it.
[Nexus 5 General] nfaust01:
That is me too. I have zero issues. Only thing that my n5 did was the black camera screen. Rebooted and haven't seen that issue again. I also got PVS 4
[Nexus 5 General] phayzer5:
PVS 3, 0.539749

on a black 16g if that is being tracked/makes a difference
[Nexus 5 General] Higgsy:
Mines a 2, I can manage a 75 undervolt, 100 crashes as soon as its set. I don't under volt anyway just thought I would test!
[Nexus 5 General] dweekie:
PVS 2 with -75 max as well....
[Nexus 5 General] cgulliver:
Got a 3
[Nexus 5 General] Audioboxer:
PVS4

My top voltage running on franco kernel is 950mv.

This is my second Nexus 5, first one went to 1000mv at the top, never checked the binning. Vibration motor is screwed on this one even worse than the first, but the screen and chip are good so I'm keeping it.
[Nexus 5 General] dipzb90:
PVS 3...not that i know what it means
[Nexus 5 General] ogboot:
PVS 4 Black 32gb
[Nexus 5 General] Cheater912:
Nothing shows up for me when I type in the command. I was mistaken before.

0_a127@hammerhead:/ $ su

root@hammerhead:/ # dmesg | grep PVS

1|root@hammerhead:/ # dmesg | grep PVvfdjhfef

1|root@hammerhead:/ #

Edit: I had event logging off lol

PVS 3 here

Sent from my Nexus 5
[Nexus 5 General] Tzfardaya:
my turn

32gb Black

PVS 4

(I'd give the timing, but it really doesn't mean much...)

So, this means mine will handle undervolting to a greater extent than a PVS 2?
[Nexus 5 General] cernekee:
Nowadays, many SoCs are designed with adaptive voltage scaling features that detect these silicon process characteristics through hardware performance monitors, and dynamically adjust the supply voltage to hit the "sweet spot" for each individual chip:

http://www.ti.com/lit/ml/slyb186/slyb186.pdf

http://cseweb.ucsd.edu/classes/wi10/cse241a/slides/Sorin_System.pdf

It isn't clear from the product brief whether the Snapdragon 800 has AVS. But if it did, the benefits of manually tweaking the supply voltage may be limited, because you're probably already running at the optimal setting.

BTW, please note that running your SoC out of spec can result in bitflips and slow corruption of data. Most of the time this shows up as random unexplained crashes, but if you're unlucky it can corrupt data on the flash. And if you're extremely unlucky it could clobber something sensitive like the EFS partitions.
[Nexus 5 General] britoso:
Got a 4

root@hammerhead:/ # dmesg|grep PVS

<6>[ 0.659963] acpuclk-8974 qcom,acpuclk.30: ACPU PVS: 4

root@hammerhead:/ #
[Nexus 5 General] ahfunaki:
PVS 3
[Nexus 5 General] nitrogen618:
PSV 2. Can't handle UV more than -100.
[Nexus 5 General] ogboot:
PVS 4
[Nexus 5 General] pfak:
You don't need root to view the kernel buffer, use dumpstate:

shell@hammerhead:/ $ dumpstate | grep PVS
dumpstate | grep PVS
<6>[ 0.457323] acpuclk-8974 qcom,acpuclk.30: ACPU PVS: 2
[Nexus 5 General] RussianBear:
How about a poll? :)
[Nexus 5 General] cephaus:
Got PVS1
[Nexus 5 General] jazzor:
According to acpuclock-8974.c there are actually 6 (SIX!! or 7 depending on whether index "6" is actually used) bins this time:

/* 8974v2 2.3GHz Parts */
[1][0] = { acpu_freq_tbl_2p3g_pvs0, sizeof(acpu_freq_tbl_2p3g_pvs0) },
[1][1] = { acpu_freq_tbl_2p3g_pvs1, sizeof(acpu_freq_tbl_2p3g_pvs1) },
[1][2] = { acpu_freq_tbl_2p3g_pvs2, sizeof(acpu_freq_tbl_2p3g_pvs2) },
[1][3] = { acpu_freq_tbl_2p3g_pvs3, sizeof(acpu_freq_tbl_2p3g_pvs3) },
[1][4] = { acpu_freq_tbl_2p3g_pvs4, sizeof(acpu_freq_tbl_2p3g_pvs4) },
[1][5] = { acpu_freq_tbl_2p3g_pvs5, sizeof(acpu_freq_tbl_2p3g_pvs5) },
[1][6] = { acpu_freq_tbl_2p3g_pvs6, sizeof(acpu_freq_tbl_2p3g_pvs6) },
[1][7] = { acpu_freq_tbl_2p3g_pvs6, sizeof(acpu_freq_tbl_2p3g_pvs6) },

As the nexus 4, the votlage table varies from PVS 1 (highest voltage needed) -> PVS 6 (lower voltages).

It seems that 3 is a good average, with each step reducing the nominal voltages by about 0.15mV linearly across all frequencies.

See acpuclock-8974.c for exact volts.
[Nexus 5 General] bfspider:
pvs 3, .459
[Nexus 5 General] jazdw:
I got PVS 4. The number between the square brackets is the dmesg log time, seconds since boot when the message was logged. Means nothing.

edit. Yeah dont need root, use dumpstate