Database Users

Undervolting Thread

This thread has been created to share Undervolting Settings (UV).
Undervolting makes CPU/GPU/Modem to consume less power, thus extend battery life. This is allowed by flashing modified kernels that allow UV (Thanks to raspdeep's work). One can use Voltage Control to change settings (Thanks to xan).
Setting format is -x mV for a given CPU clock as used in xan's app: [1200Mhz] [1000Mhz] [800Mhz] [400Mhz] [200Mhz] [100Mhz]
What are your settings?
PS: Please edit your very first post with settings instead of reposting. Thank you!

Stable: 50 50 75 100 100 100
1200 max: 50
1000 max: 50
800 max: 75

I am currently running 50 50 50 75 100 100 with no stability problems. It has made 4 back-to-back quadrant runs and a couple days of general usage without any crashes so far.

Undervolting doesn't work well with my phone the same with overclocking. I can't undervolt 1000Mhz and above because it causes much stability issues here. I can only undervolt 100-800Mhz with settings < 100mV.

TheVisitorX said:
Undervolting doesn't work well with my phone the same with overclocking. I can't undervolt 1000Mhz and above because it causes much stability issues here. I can only undervolt 100-800Mhz with settings < 100mV.
Click to expand...
Click to collapse
My system hangs in sleep mode when I have setCPU or Superpower with sidekick on.

I have the max cpu capped at 800mhz using SetCpu.
Undervolted -50 for 800mhz 600 400 200 and 100 each.Phone was at 50% last night and 6 hours later it's dead.Battery was completely discharged.All i did was set everything at 50Mvs less.Correct ? i think i'm missing something.Do help.thanks.

hey guys
im new to oc and uv
im currenlty using ramads gb jvh with hardcores speedmod kernel
ive got tegraks ultimate app and have oc'd it to 1100 as anything above reboots my phone
everything else is the same as standard
i was wondering if anyone else can help me with what i should change
i have no clue,
so far
frequency 1100
core 1275mv
internel 1100
cpu level 1
frequency 800
core 1200
internel 1100
cpu level 2
frequency 400
core 1050
internal 1100
cpu level 3
frequency 200
core 950
internal 1100
cpu level 4
frequency 100
core 950
internal 1000
these values are all stock, i havent touched them
im wanting to know what i should change them to
thanks
forgot to add, my battery life is really bad, i use hsdpa and wifi frequently

i have cm7 #19 with the (latest) glitch v10b-VC kernel..no oc, bu uv
100mhz -50,200mhz -50,400mhz -50, 800mhz -25 and 1000mhz @stock

What is the negative effects of UV?
My current values starting at 1000mhz is:
-75
-100
-100
-125
-175

hackeron said:
What is the negative effects of UV?
My current values starting at 1000mhz is:
-75
-100
-100
-125
-175
Click to expand...
Click to collapse
Negative effects come in the form of stability issues and random reboots. Is doesn't physically damage the processor. By lowering the core voltage supplied to the CPU, you also decrease the noise margin for the CPU to properly differentiate between logic 1 and logic 0. This is why -75, for example, works for some and not for others because processors are not 100% identical. The obvious benefit UV is lower power consumption.

gtda said:
hey guys
im new to oc and uv
im currenlty using ramads gb jvh with hardcores speedmod kernel
ive got tegraks ultimate app and have oc'd it to 1100 as anything above reboots my phone
everything else is the same as standard
i was wondering if anyone else can help me with what i should change
i have no clue,
so far
frequency 1100
core 1275mv
internel 1100
cpu level 1
frequency 800
core 1200
internel 1100
cpu level 2
frequency 400
core 1050
internal 1100
cpu level 3
frequency 200
core 950
internal 1100
cpu level 4
frequency 100
core 950
internal 1000
these values are all stock, i havent touched them
im wanting to know what i should change them to
thanks
forgot to add, my battery life is really bad, i use hsdpa and wifi frequently
Click to expand...
Click to collapse
I'm also using Tegrak's overclock apk for some time now (from beginning) and it's really good!
Just lower the core voltage (start with cpu level 0) until it's unstable (random reboots), then add a few mv (+5) to make it stable again (no reboots). do this for every core frequency (only one at the time, so you know witch one is making the system unstable). I never touch the internal frequency... Undervolting will NOT damage your CPU (overclocking can if you're not carefull)
Don't be stupid testing just a few hours, test (stress test) for days. Only then you are sure it's stable
These are my settings:
(rock stable after a few weeks => playing asphalt6, running quadrant and smartbench hours a day for a few weeks,...)
cpu level 0
frequency 1000
core 1205mv (-70) => could get it stable at 1200 but had one reboot after one week, so I added +5
internel 1100
cpu level 1
frequency 800
core 1105 (-95) => could get it stable at 1100 but had one reboot after one week, so I added +5
internel 1100
cpu level 2
frequency 400
core 950 (-100)
internal 1100
cpu level 3
frequency 200
core 825 (-125)
internal 1100
cpu level 4
frequency 100
core 825 (-125)
internal 1100
Now I know what my lowest core voltage is, I can start overclocking (not for now).
I'm on stock deodexed JVP 2.3.4 with Hardcore (latest) Speedmod (partition EXT4), Tegrack Overclock Ultimate and Voodoo Control Plus (holy combo => Quadrant 2400+ (no OC, just UV) and wow, what a great battery life!
edit: yes, I need to update my signature

SamHaLeKe said:
cpu level 4
frequency 100
core 825 (-125)
internal 1100
Click to expand...
Click to collapse
^ Typo??????????
internal voltage @ 100Mhz is 1000mV by default, so you are overvolting.

kiwijunglist said:
^ Typo??????????
internal voltage @ 100Mhz is 1000mV by default, so you are overvolting.
Click to expand...
Click to collapse
Default value is 950mV on my phone according to pimpmycpu. According to SamHaLeKe's post, he's reducing his by -125 so 825mV is correct
I'm new to UV, and just experimenting. My current values are
1200 = -50mV
800 = -50mV
400 = -100mV
200 = -100mV
100 = -150mV
Seems ok so far, more aggressive cutting gave me reboots

$$$

The most i could get from my phone w/o stability issues
1500 - 50
1400 - 50
1300 - 50
1200 - 50
1000 - 50
800 - 75
400 - 100
200 - 125
100 - 150

Starting from 1000MHz, I'm using these values :
-50 [1000]
-75 [800]
-100 [400]
-125 [200]
-150 [100]
No stability issues since then !

Mine are;
1000 : 50
800 : 50
400 : 75
200 : 75
100 : 100
Works great for me
Sent from my GT-I9000 using Tapatalk

swaakx said:
Starting from 1000MHz, I'm using these values :
-50 [1000]
-75 [800]
-100 [400]
-125 [200]
-150 [100]
No stability issues since then !
Click to expand...
Click to collapse
i have the same!
my phone now cold as ice. and greatly stable

I'm a noob at this UV stuff but I'm quite interesting about that.
I tried with Control Freak, should I set first a low voltage on 100Mhz and try to stress the cpu only with this change on 100MHZ? or should I set all voltages and test?
thx for help

i'm on jvq darkyrom
using tegrak overclock ultimate
1200mhz 1255 (-20)
800mhz 1105 (-95)
400mhz 950 (-100)
200mhz 850 (-100)
100mhz 810 (-140)

Post your voltage settings and your experience ...

Hi @all,
everyone is invited to post
1. ROM
2. Kernel
3. Kernel settings
4. UV settings
independently of ROM or Kernel used.
It might be a good starting point to compare other user´s experience.
Before using the settings postet in this thread please keep in mind that each device is different. Good settings for device A might produce freezes on device B.
So share your and enjoy other´s experience´s ...
here are my stable settings:
ROM: CheckROM RevoHD v6
Kernel: N.E.A.K. 1.4x
CPU Gorvernor: conservative (with all tweaks over CWM recovery enabled)
I/O Sched: sio
200 Mhz - 1200 Mhz
Voltages:
100 Mhz - 850 mV (... can´t go lower for testing with voltage control )
200 Mhz - 850 mV (... can´t go lower for testing with voltage control )
500 Mhz - 875 mV
800 Mhz - 975 mV
1000 Mhz - 1075 mV
1200 Mhz - 1175 mv
GPU settings:
Low: 133 Mhz - 800 mV
High: 133 Mhz - 800 mV
I am not a gamer and this settings are solid stable for my device. I use the phone mainly for (heavy) phone call´s (I know its old fashion ) and @home for surfing via WIFI. I enable my mobile data connection only when I need it.
This setting´s give me 3 - 4 days battery life.
I use lulzactive governor and vr I/O sched before and I feel NO difference in performance compared with the above settings (regarding scrolling through menus, starting apps ...), but the above settings gives me better battery.
Regards
Antonio
Update: I have to mention that I have the 2000 mAh Samsung battery.

OROM: Stock 2.3.5
Kernel: N.E.A.K 1.3.3.x
Voltage controls: All default.
100-800mhz
Lulzactive, VR
I usually get 1 & a half days battery, with an average of 7 hours screen time. The phone still runs beautifully while playing games and such so I have no problems in that category.
Edit:
Wifi on 80% of the time, a few hours of XDA. Skype on 100% while wifi is on. A few hours of games (dolphin, mc3, cut the rope, etc.), hours of Internet browsing, etc.
Sent from my GT-I9100 using XDA

A last note:
Posting your settings and your battery charge cycle, please also mention the way you using your phone during the day to make your post more comparable ...
have fun

Voltages
Using Checkrom V6, lulzactive gov. NEAK Kernel
1200mhz @ 1150mV
1000 @ 1050
800 @ 975
500 @ 875
200 @ 850
100 @ 825 (min freq is 200mhz anyway, so this freq is not used at all)
Rock solid, never a kernel panic/crash
My battery last 2 days with push Exchange connectivity, gmail pushing too, some gaming (no more than 1h x day), 1h voice calls x day, normal texting activity (30-50 daily text messages) and automatic brightness customized to be darker than default.
Battery last longer if you do not let fully discharge it (plug it at night if you can, no matter the charge left).

@Floodland
I usually don´t let the battery go down below 15% - 20%, then I start a new charge ... I break this rule only in case on an emergency when no charger is near by me
I´ll try your 1000 MHz and 1200 MHz voltage setting´s, will post back if they work on my phone

ROM:Custom Made DXKL3
Kernel:SiyahKernel 2.6.13
Governor:SIO,ondemand
Voltages:
100 Mhz - 800 mV
200 Mhz - 850 mV
500 Mhz - 900 mV (default)
800 Mhz - 950 mV
1000 Mhz - 1050 mV
1200 Mhz - 1150 mv
1400 Mhz - 1250 mV
1600 Mhz - 1350 mV
GPU settings:
1: 133 Mhz - 800 mV
2: 266 Mhz - 950 mV
3: 400 Mhz - 1100mV
battery life around 2 days with light usage, 8 hours for heavy usage.
at present 44% after 32 hours, with 2:15 hours display on, wifi on, 3G off

ROM: All GB ROMs
KERNEL: Siyah, NEAK and Redpill
SCHEDULER: Usually I keep it unchaged
GOVERNOR: ondemand or conservative
FREQUENCY: 200MHz- 800 or 1000 or 1200MHz
UV:
-CPU
200MHz - 800 mV
500MHz - 850 mV
800MHz - 950 mV
1000MHz-1050mV
1200MHz-1150 mV
FYI, I always use this cpu uv settings from 6 months ago -- since the first time I got my SGS2 undervolted while using ninphetamine kernel, to be exact. It always stable on my SGS2.
GPU:
133 MHz - 800 MHz
267 MHz - 950 MHz
Sent from my GT-I9100 using xda premium

New voltages ...
Hi @all,
here are my settings after new tests. The stability was testet by three sequential cycles of the N.E.A.K tester in each (fix) frequency:
100 Mhz - 850 mV
200 Mhz - 850 mV
500 Mhz - 850 mV
800 Mhz - 950 mV
1000 Mhz - 1050 mV
1200 Mhz - 1150 mv
Will test in next bettery cycle if they are stable in daily use, and report. Fell quite secure cause i´m not a heavy user...
Will test the settings starting tomorrow with the new N.E.A.K 1.4.1x kernel (simone told in his thread that the kernel should be released this afternoon).

ROM: Fatal1ty Extreme Edition (XWLA4)
Kernel: Red Pill 1.3
CPU Gorvernor: conservative
I/O Sched: sio
200 Mhz - 1200 Mhz
Voltages:
100 Mhz - 825 mV (Stable but not in use as it tends to lag a bit)
200 Mhz - 825 mV
500 Mhz - 875 mV
800 Mhz - 950 mV
1000 Mhz - 1025 mV
1200 Mhz - 1125 mv
1400 Mhz - 1225 mv (Stable but not in use as don't need it)
1500 Mhz - 1350 mv (Stable but not in use as don't need it)
GPU settings:
Low: 114 Mhz - 800 mV
High: 267 Mhz - 950 mV
I have 2 Exchange accounts on push, Gmail Push, hotmail every hour, and moderate use. Screen time Usually between 2-4 hours. Used to get 2 days, but getting epic wakelocks from google services since the Google Play update. so im trying work that out. at the moment of about 14 hours i have 2hours screen time and 34% battery left.

Red pill rules
ROM: Checkrom revo hd V6 (XWLA4)
Kernel: Red Pill 1.3
CPU Gorvernor: Hyper
I/O Sched: N/A
200 Mhz - 1200 Mhz
Voltages:
100 Mhz - 900 mV
200 Mhz - 900 mV
500 Mhz - 950 mV
800 Mhz - 1000 mV
1000 Mhz - 1100 mV
1200 Mhz - 1200 mv
1400 Mhz - N/A
1500 Mhz - N/A
I USED THE KERNEL Neak BUT I'll take the RED PILL IS SIMPLY THE BEST BUT THE BEST OF SIYAH MORE FLUID AND ENHANCED THIS LAST

TWO CORES ARE ENABLED
did a test for each freq and volt with STABILITY TEST app.
ROM: cognition 1.51
Kernel: Siyah 2.6.14
I/O Schrduler: sio
CPU Gorvernor: smartassV2
CPU:
100 Mhz - 1600 Mhz
Voltages:
100 Mhz - 850 mV
200 Mhz - 850 mV
500 Mhz - 875 mV
800 Mhz - 950 mV
1000 Mhz - 1050 mV
1200 Mhz - 1200 mv
1400 Mhz - 1275
1600 Mhz - 1400 mv
GPU:
100Mhz-800mv
267Mhz-950mV
normally working from 100mhz-800mhz.
i managed to get lower mv for the cpu and stable but it was the limit. so i added 25mv more for more stable results.

Who dares trying my extreme UV values ? ​
My UV stable table (Mhz/mA) :
1200 (1125) | 1000 (1025) | 800 (950) | 500 (850) | 200 (800) | 100 (800)
Noop + On demand.
Thanks to NEAK for its magic on my S2

ROM: CM9
Kernel: NEAK 2.0.2x
I/O Schrduler: vr
CPU Gorvernor: ondemand
CPU:
200 Mhz - 1000 Mhz
Voltages:
200 Mhz - 850 mV
500 Mhz - 900 mV
800 Mhz - 950 mV
1000 Mhz - 1050 mV
GPU:
133Mhz-800mv
166Mhz-800mV
Works perfect for me. Always heavy usage and get nearly 24hours with standard battery. Screen on time 4 hours. With siyah I had nearly the half of the uptime.
Wifi always on. Sync on. I mean this is what it was made for
-sent from sgs2 tapatalk

Ics stable voltages UV/OC

HI
since in ICS firmwares we can talk about different cpu voltages than gb and i think it's a hot subject mostly in kernel threads i believe i can start this thread because many are interested about this. i use speedmod kernel k3-7 and i can use only tegrak overclock ultimate to change voltages. my stable config is:
200 mhz- 825 mv
500 mhz-925 mv
800 mhz-975 mv
1000 mhz-1050 mv
1200 mhz-1150 mv
with this config i get no freeze or sod. so please post your stable config too.
new info:
-seems that i can't go below 925 mv at 500 mhz
-i will see how the battery life will go with these voltages and i will post some pictures because i am interested in undervolting for battery life.
i also saw a post in neak ics kernel where a user had 7 h and 32 minutes display time.

pissyhun said:
HI
since in ICS firmwares we can talk about different cpu voltages than gb and i think it's a hot subject mostly in kernel threads i believe i can start this thread because many are interested about this. i use speedmod kernel k3-7 and i can use only tegrak overclock ultimate to change voltages. my stable config is:
200 mhz- 825 mv
500 mhz-925 mv
800 mhz-975 mv
1000 mhz-1050 mv
1200 mhz-1125 mv
with this config i get no freeze or sod. so please post your stable config too.
Click to expand...
Click to collapse
What were your gb values?
Sent from my GT-I9100 using Tapatalk

Yes, I don't see the values changing with ICS.

I should pay some more time on it... 825mV for 200MHz so amazing

hi
it seems if i go down 925 mV for 500 mhz i got freeze.

Hrithan2020 said:
What were your gb values?
Sent from my GT-I9100 using Tapatalk
Click to expand...
Click to collapse
hi
theese were my values in gb roms:
1200mhz - 1150mv (stock = 1250mv)
1000mhz - 1050mv (stock = 1150mv)
800mhz - 950mv (stock = 1050mv)
500mhz - 875mv (stock = 975mv)
200mhz - 850mv (stock = 975mv)
and i used phenomenal 4.0 extreme without freeze or sod.
my phone was produced in octomber 2011.

pissyhun said:
hi
theese were my values in gb roms:
1200mhz - 1150mv (stock = 1250mv)
1000mhz - 1050mv (stock = 1150mv)
800mhz - 950mv (stock = 1050mv)
500mhz - 875mv (stock = 975mv)
200mhz - 850mv (stock = 975mv)
and i used phenomenal 4.0 extreme without freeze or sod.
my phone was produced in octomber 2011.
Click to expand...
Click to collapse
Strange.. Are you sure, that you had set the lowest possible values for GB?
For me, it looks as if I would have to increase the voltages a bit in ICS.
Haven't looked too much into it.. [running CM9 with Siyah rc3.. both beta.. need work]

GB voltage:
1200 MHz - 1150 mv
1000 MHz - 1050 mv
800 MHz - 950 mv
500 MHz - 850 mv
200 MHz - 800 mv
Always stable for me. I always use this voltage settings until I update my phone into ICS.
ICS voltage:
1200 MHz - 1150 mv
1000 MHz - 1050 mv
800 MHz - 950 mv
500 MHz - 925 mv
200 MHz - 800 mv
It seems I can't set the voltage for 500 MHz lower anymore. Otherwise the phone will freeze.
Sent from my GT-I9100 using xda premium

so far so good.
they seem to be working for me as well.
using Siyah latest kernel and Hydrog3n rom.

hi
some users reported theese voltages to be stable:
200-800 mv
500 - 925 mv
800 - 950 mv
1000 - 1050 mv
1200 - 1125 mV

pissyhun said:
hi
it seems if i go down 925 mV for 500 mhz i got freeze.
Click to expand...
Click to collapse
Hahaha, Are you really sure ?
Who dares trying my extreme UV​ values ?​
My UV stable table (Mhz/mA) :
1200 (1125) | 1000 (1025) | 800 (950) | 500 (900) | 200 (800) | 100 (800)
Noop + On demand.
Thanks to NEAK for its magic on my S2

Hi
Changed kernel-neak and i use now
850 900 950 1025 1125 mv
Sent from my GT-I9100 using XDA

well this are my settings:
Min/max: 100 mHz-1200mHz
vr - smartassV2
100 - 825
200 - 875
500 - 925
800 - 975
1000 - 1050
1200 - 1150
Siyah 3.0
i tryied to go a lil bit under this settings, but then i had some freezes. i think 500 and 800 makes the most problems.

on ics i have to pull up a bit the voltages that were stable for me on gb, but the annoying thing is that i can´t go less than 925mv for 500mhz step, i get freezes and on gb i was on 875

I'm running 200Mhz 775mV stable
800Mhz 925mV
But cant get stable at 1600Mhz, I get freeze on anything between 1325-1500mV
Anyone can?

This thread is kind of useless .. every phone supports different UV !
Sent from my GT-I9100 using xda premium

I dont think so
Sent from my GT-I9100 using XDA

i am confused cause all tht magic an other tweaks really dint work for me,i tried all but sometimes the phone runs jus for few mins and right now my phone is fully loaded like 400+apps an iam downloading more day by day too check how much sgs2 will handle.an yes i think every phone is diff...

Jodelaplaya said:
This thread is kind of useless .. every phone supports different UV !
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
pissyhun said:
I dont think so
Sent from my GT-I9100 using XDA
Click to expand...
Click to collapse
Well, each phone has different tolerance to Undervolting. I for example can not go lower then these values:
200MHz - 900/925mV
500MHz - 950/975mV
800MHz - 1050mV
1000MHz - 1100-1150mV
1200MHz - 1250mV
If I go lower then 1250mV for 1200MHz, I will get freezes (if not instant then when browsing the net or something heavy). As you can see my values are not so "extreme", other people can undervolt much more.
There has been one succesfull thread of this type from Geko, it's called MagicConifg (if you click on Undervolting in my signature you will be taken there). He tested for months which UV settings would work for 99% of the people. I was one of the few people that couldn't handle his config
Anyway, I don't say that this thread is totally useless. Discussing UV settings can be helpfull for others which are new to Undervolting. But for me the UV settings have stayed the same as on GB, don't know if it's so different UV'ing on GB and on ICS.
As long as people realise: the settings that work for somebody may not work on your own phone! A lot of people in this thread undervolt heavy and there is a big chance your own phone will freeze (and if you set it on boot and can't remove them anymore, that means reflashing your rom...). So be carefull

Cm9 rom/kernal
200 @ not used
500 @ 825 mV
800 @ 950 mV
1000 @ 1050 mV
1200 @ 1150 mV

Best ICS combo for gaming and performance finally found !!

Hello there,
many threads here in General and in QA,are asking about the best ROM,the best Kernel,or the best combo to get the highest performance and a lag free experience,i was also trying of finding the best combination,but i decided to do it the hard way,i started flashing and flashing,tweaking kernel settings trying to achieve the greatest performance.
at the end i achieved a combo that's making my nexus s run super smoothly with full trebuchet animations and good game experience (running N.O.V.A 3 without any lag ) anyway here is what i tried,it's pretty stable with me and offer a great performance (though battery isn't that good well that's the price of performance)
ROM
CYΔNULTRΔ
KERNEL
Matr1x BFS
KERNEL SETTINGS
(edit those with NStools)
Governor: Lionheart
Min CPU freq: 200 MHz
Max CPU freq: 1300 MHz (you could try 1460 MHz but i found 1300 more stable)
Deep Idle: ON
ARM VOLTAGE
Max Arm Volt: 1500 mV
1460mhz: 1450 mV
1300mhz: 1400 mV
1200mhz: 1325 mV
1000mhz: 1250 mV
800mhz: 1200 mV
400mhz: 1050 mV
200mhz: 950 mV
100mhz: 950 mV
INT VOLTAGE
Max Int Volt: 1300 mV
1460mhz: 1200 mV
1300mhz: 1150 mV
1200mhz: 1100 mV
1000mhz: 1100 mV
800mhz: 1100 mV
400mhz: 1100 mV
200mhz: 1100 mV
100mhz: 1000 mV
(voltages slightly raised from the stock matr1x voltages)
and a big thank for the great devs offering us all those roms and kernels really thank you for your hard work

[Q] franco r41-42 cannot change voltage of individual frequencies?

Hello xda forums.
I've recently come into posession of a Nexus 7 (C80) and beside from a slight lift on the left that gets a little worse from heat and the screen flicker issue, it works fine.
I've been trying to undervolt this thing using franco's kernel (tried r41 and r42) but noticed a very peculiar issue apparent in Trickster Mod (which what I was using).
It seems that changing the voltage for a single frequency has no effect, while applying a global offset seems to take effect. Let me try to explain this further...
Let's say I want to undervolt the 1300 MHz frequency, and want to try 975 mV.
So I run Stability Test app in the background and set performance governor. This pretty much ensures the tegra 3 is running at 1.3 GHz.
So I go in trickster mod, "Specific" tab, and I tap 1300 Mhz and I set 975 mV and press the tick mark at the top to apply... It says "Applied".
No crash... Then I try 950 mV... still no crash, 925, 900, 700 (!), no crash...
so I reboot the n7 and try to reach 975 mV by applying a global offset of -150 (stock is 1125 mV for 1.3 GHz as it appears to me). Immediately after I tick apply, I get freeze / reboot, meaning it worked.
Using the global offset method, I can get stable UV by a global offset of -75 mV (ie: 1050 mV for 1.3 GHz) on my N7.
In both cases, I verified that changing 1 frequency or changing all of them does apply correctly, I opened a terminal and su'd and I did a:
cat /sys/devices/system/cpu/cpu0/cpufreq/UV_mV_table
it shows the expected results, but it doesn't seem to actually take effect when changing 1 frequency only (otherwise it would have froze by now).
Am I the only one missing this ? Is this a bug in trickster ? Is there a hidden catch ?
ROM: SmoothROM 4.3
Kernel: Franco Kernel r41 and r42 (tested this behavior on both).

First, your post is very difficult to read. You are using "MHz" for both frequency and voltage (in mV).
I can't speak to the kernel you're using, but 1300mhz is one of the frequencies that is not "directly" supported as a voltage set point on the Tegra 3, as far as I can tell.
Per my understanding of the chip, the voltage set points are separate from the frequency set points, and it uses the "closest" one.
At least with the M-Kernel (somewhat overclocked), I have the following frequency steps (in mhz):
51, 102, 204, 340, 475, 666, 860, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700
However, the frequency set points are:
(LP core) 204, 342, 475, 555, 666
(G core) 550, 770, 910, 1050, 1230, 1280, 1330, 1370, 1400, 1500, 1600, 1700
As the chip picks the "closest" voltage, what this means is that for the 1300mhz frequency, the 1280mhz slot is the one selecting the voltage. This also means that you cannot set the voltage for each frequency step in some cases, as multiple frequencies may share a slot.
You may have to look at the kernel settings directly through the exported variables if TricksterMod is not displaying the correct data.
For me, I can only get down to 1005-1000mv at 1300mhz.
What do you get when you cat /sys/devices/system/cpu/cpu0/cpufreq/UV_mV_table ?
On M-Kernel a33, I get:
Code:
1600mhz: 1095 mV
1500mhz: 1040 mV
1400mhz: 1000 mV
1370mhz: 1000 mV
1330mhz: 1005 mV
1280mhz: 1005 mV
1230mhz: 1005 mV
1150mhz: 965 mV
910mhz: 915 mV
910mhz: 915 mV
770mhz: 850 mV
770mhz: 850 mV
550mhz: 800 mV
550mhz: 800 mV

I apologize for the difficulty of reading my post. The issue is difficult to explain precisely and I was in haste.
I've edited my post to fix some mistakes, thanks for the feedback.
on Franco Kernel (r41), I get the following table on reading the table directly (without any UV applied). Trickster is displaying the same readings.
Code:
1300 1125
1200 1100
1100 1075
1000 1050
900 1025
800 1000
700 975
600 950
500 925
400 900
300 875
200 850
100 825

Very interesting. That doesn't map with what I've seen of the Tegra3 documentation elsewhere.
I wonder if the kernel is setting values that the hardware doesn't support.