[Undervolt][Flashable] Oneplus 5T undervolt.

[[email protected]]

Steps:
1. Download https://github.com/lyq1996/msm8998_offset_voltage/releases/download/v1.0/msm8998-Undervolt-Tool.zip
2. Reboot to TWRP and select msm8999-Undervolt-Tool.zip
3. Enjoy.

Others:
1. How to check my current gpu and cpu voltage?

Open your terminal and run:
su -c dmesg -T | grep -E "add_opp|gfx3d_"

2. Most 835 can easily undervolt cpu 100mv and gpu 200mv!

3. Done in your own risks.

 

[miky10]

hello, wanted to check my stock voltage but your line gave me no results on the terminal, anything i am doing wrong? thanks

 

[[email protected]]

hello, wanted to check my stock voltage but your line gave me no results on the terminal, anything i am doing wrong? thanks

Please reboot.
dmesg store in kernel ring buffer, it will replace old log when hit the buffer size.

 

[NTLinhHaHa]

Does this undervolt require a custom kernel?

 

[jraman]

Steps:
1. Download https://github.com/lyq1996/msm8998_offset_voltage/releases/download/v1.0/msm8998-Undervolt-Tool.zip
2. Reboot to TWRP and select msm8999-Undervolt-Tool.zip
3. Enjoy.

Others:
1. How to check my current gpu and cpu voltage?

Open your terminal and run:
su -c dmesg -T | grep -E "add_opp|gfx3d_"

2. Most 835 can easily undervolt cpu 100mv and gpu 200mv!

3. Done in your own risks.

just flashing is enough?
how to change the setting of undervolt (like -25,-50,-75...)

 

[[email protected]]

just flashing is enough?
how to change the setting of undervolt (like -25,-50,-75...)

via aroma

 

[dsjd]

Will this work with blu_sprk? cause blu_sprk uses magisk to flash the kernel systemlessly

 

[[email protected]]

Will this work with blu_sprk? cause blu_sprk uses magisk to flash the kernel systemlessly

It's not kernel.
Just a tool that undervolt by modify voltage_fuse in kernel_dtb.

So all roms and all recovery should work fine.

 

[dsjd]

It's not kernel.
Just a tool that undervolt by modify voltage_fuse in kernel_dtb.

So all roms and all recovery should work fine.

Cool. What's the max that I can undervolt? Also at what stage of boot does the undervolt kick in?

 

[yChoon]

:/ $ su -c dmesg -T | grep -E "add_opp|gfx3d_"
[Sat May 16 07:10:53 2020] gfx3d_clk_src: set OPP pair(180000000 Hz: 548000 uV) on 5000000.qcom,kgsl-3d0
[Sat May 16 07:10:53 2020] [ 0.410422]@4 gfx3d_clk_src: set OPP pair(710000000 Hz: 764000 uV) on 5000000.qcom,kgsl-3d0
[Sat May 16 07:10:53 2020] [ 0.435766]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu0
[Sat May 16 07:10:53 2020] [ 0.436387]@4 add_opp: Set OPP pair (1900800000 Hz, 788000 uv) on cpu0
[Sat May 16 07:10:53 2020] [ 0.436414]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu1
[Sat May 16 07:10:53 2020] [ 0.436794]@4 add_opp: Set OPP pair (1900800000 Hz, 788000 uv) on cpu1
[Sat May 16 07:10:53 2020] [ 0.436821]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu2
[Sat May 16 07:10:53 2020] [ 0.437200]@4 add_opp: Set OPP pair (1900800000 Hz, 788000 uv) on cpu2
[Sat May 16 07:10:53 2020] [ 0.437229]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu3
[Sat May 16 07:10:53 2020] [ 0.437611]@4 add_opp: Set OPP pair (1900800000 Hz, 788000 uv) on cpu3
[Sat May 16 07:10:53 2020] [ 0.437636]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu4
[Sat May 16 07:10:53 2020] [ 0.438185]@4 add_opp: Set OPP pair (2457600000 Hz, 880000 uv) on cpu4
[Sat May 16 07:10:53 2020] [ 0.438211]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu5
[Sat May 16 07:10:53 2020] [ 0.438758]@4 add_opp: Set OPP pair (2457600000 Hz, 880000 uv) on cpu5
[Sat May 16 07:10:53 2020] [ 0.438789]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu6
[Sat May 16 07:10:53 2020] [ 0.439338]@4 add_opp: Set OPP pair (2457600000 Hz, 880000 uv) on cpu6
[Sat May 16 07:10:53 2020] [ 0.439367]@4 add_opp: Set OPP pair (300000000 Hz, 568000 uv) on cpu7
[Sat May 16 07:10:53 2020] [ 0.439914]@4 add_opp: Set OPP pair (2457600000 Hz, 880000 uv) on cpu7
[Sat May 16 07:10:53 2020] [ 0.749548]@4 iommu: Adding device 5040000.qcom,kgsl-iommu:gfx3d_user to group 11
[Sat May 16 07:10:53 2020] [ 0.749827]@4 iommu: Adding device 5040000.qcom,kgsl-iommu:gfx3d_secure to group 12
:/ $

Can someone tell me how to read this? As far as i understand, uV should be negative right?

 

[yChoon]

:/ $ su
:/ # su -c dmesg -T | grep -E "add_opp|gfx3d_"
[Sat May 16 08:11:55 2020] gfx3d_clk_src: set OPP pair(180000000 Hz: 648000 uV) on 5000000.qcom,kgsl-3d0
[Sat May 16 08:11:55 2020] [ 0.422595]@4 gfx3d_clk_src: set OPP pair(710000000 Hz: 964000 uV) on 5000000.qcom,kgsl-3d0
[Sat May 16 08:11:55 2020] [ 0.447935]@4 add_opp: Set OPP pair (300000000 Hz, 660000 uv) on cpu0
[Sat May 16 08:11:55 2020] [ 0.448564]@4 add_opp: Set OPP pair (1900800000 Hz, 900000 uv) on cpu0
[Sat May 16 08:11:55 2020] [ 0.448592]@4 add_opp: Set OPP pair (300000000 Hz, 660000 uv) on cpu1
[Sat May 16 08:11:55 2020] [ 0.448980]@4 add_opp: Set OPP pair (1900800000 Hz, 900000 uv) on cpu1
[Sat May 16 08:11:55 2020] [ 0.449014]@4 add_opp: Set OPP pair (300000000 Hz, 660000 uv) on cpu2
[Sat May 16 08:11:55 2020] [ 0.449409]@4 add_opp: Set OPP pair (1900800000 Hz, 900000 uv) on cpu2
[Sat May 16 08:11:55 2020] [ 0.449439]@4 add_opp: Set OPP pair (300000000 Hz, 660000 uv) on cpu3
[Sat May 16 08:11:55 2020] [ 0.449838]@4 add_opp: Set OPP pair (1900800000 Hz, 900000 uv) on cpu3
[Sat May 16 08:11:55 2020] [ 0.449863]@4 add_opp: Set OPP pair (300000000 Hz, 644000 uv) on cpu4
[Sat May 16 08:11:55 2020] [ 0.450434]@4 add_opp: Set OPP pair (2457600000 Hz, 992000 uv) on cpu4
[Sat May 16 08:11:55 2020] [ 0.450463]@4 add_opp: Set OPP pair (300000000 Hz, 644000 uv) on cpu5
[Sat May 16 08:11:55 2020] [ 0.450995]@4 add_opp: Set OPP pair (2457600000 Hz, 992000 uv) on cpu5
[Sat May 16 08:11:55 2020] [ 0.451024]@4 add_opp: Set OPP pair (300000000 Hz, 644000 uv) on cpu6
[Sat May 16 08:11:55 2020] [ 0.451550]@4 add_opp: Set OPP pair (2457600000 Hz, 992000 uv) on cpu6
[Sat May 16 08:11:55 2020] [ 0.451578]@4 add_opp: Set OPP pair (300000000 Hz, 644000 uv) on cpu7
[Sat May 16 08:11:55 2020] [ 0.452104]@4 add_opp: Set OPP pair (2457600000 Hz, 992000 uv) on cpu7
[Sat May 16 08:11:55 2020] [ 0.760427]@4 iommu: Adding device 5040000.qcom,kgsl-iommu:gfx3d_user to group 11
[Sat May 16 08:11:55 2020] [ 0.760712]@4 iommu: Adding device 5040000.qcom,kgsl-iommu:gfx3d_secure to group 12
:/ #

If moderator think I'm spamming, feel free to remove it.

This is when i ran the command on stock. I saw difference with the clock speed, but i still don't understand about the uV value.

 

[Nafy77]

Will I still be able to use a mod like this if I'm on a custom ROM? Thanks!
(I'm very new to all this sorry)

 

[[email protected]]

If moderator think I'm spamming, feel free to remove it.

This is when i ran the command on stock. I saw difference with the clock speed, but i still don't understand about the uV value.

1v = 1000mv = 1000000uv, logs the command output is your current big and small core voltage.
You can observe the changes before and after using the tool to determine whether undervolt is effective

 

[[email protected]]

Will I still be able to use a mod like this if I'm on a custom ROM? Thanks!
(I'm very new to all this sorry)

Sure, work on all rom.

 

[yChoon]

1v = 1000mv = 1000000uv, logs the command output is your current big and small core voltage.
You can observe the changes before and after using the tool to determine whether undervolt is effective

Thank you! But i already observe the effectiveness, my phone has lower temperature overall + battery lasting longer with 100mv uv on cpu and 200mv uv on gpu.

However, i would advice other those who about to use this mod, after flashing remember to use kernel manager to disable core_control and enable msm_thermal. As i found out after i play some really intensive gpu game, when phone slightly heat up(warm), my whole phone freezed, i suspect core_control trying to lower the voltage more and cause issue. Ever since i disabled core_control and switch to msm_thermal, no such issue happens anymore.

 

[Xokoz]

What an absolute legend. I'm running underclocked & well optimized kernel with HW overlays disabled (you can find the init.d script in xda) and the performance/battery life are both phenomenal, now this? My phone is just sipping the juice promille at time

 

[dsjd]

Will it work with oos stock rom and stock Kernel?

 

[WireMessiah]

Does this mod get removed after flashing a new ROM or update? I have installed and love it but I am not sure if it stays undervolted after flashing a ROM and don't want to apply it twice and break my phone if it does

 

[gsser]

For me -110mv is the limit for cpu. 120 becomes unstable, 130 doesnt boot. Running gpu on -190 for now

So -100mv cpu -190 gpu.

 

[dsjd]

For me -110mv is the limit for cpu. 120 becomes unstable, 130 doesnt boot. Running gpu on -190 for now

So -100mv cpu -190 gpu.

Which kernel are you on?