Redmi Note (3G/4G) Heat Issue ~ Problem Solved

Above: latest update by user feedback. If you were to follow the steps correctly, then you would solve the heat problem.

Here’s the positive method to solve the apparent heat and resulted battery issues for Redmi Note (3G&4G).

First thing first, your device must be rooted. Here I tested with Redmi Note 4G-LTE.

After root, download Greenify and Kernel Tweaker.

What Greenify does? Is to reduce running apps in the background by hibernating them!

The main player in the problem solving is, Kernel Tweaker App.
Download it from Play Store and start to tweak the CPU and I/O Scheduler settings.
For CPU parameter, down-clocked it to 1.5GHz instead (tested on the 4G model).
Also, set the minimum clock speed to 300MHz.

For the CPU Governor, change it from OnDemand to UserSpace.
(This setting allows the CPU clock speed to be consistently locked at the value you prefer, in this case at 1.5GHz.)

Then changed the I/O Scheduler from cfq to row.
Why row (read over write) scheduler?

After testing, such combination of CPU and I/O setting produce the following results:
~ reduce heat problem when playing games.
~ improve overall battery juices/hours.
~ kept the device’s CPU state consistently at Deep Sleep if you are not using apps.
~ but when an app is launched and if CPU loading increases, the CPU state jumps to the Max. Clock Speed straight away.
~ hence, the overall fluidity of apps, web browsing and UI improved.

By the way, the CPU governor USERSPACE is considered rare on smartphone devices. It is mainly used for PCs.
However, the Redmi Note kernel consists of the UserSpace setting option and it is tested (using Kernel Tweaker app) to be useful for improving overall performance of the device. If you are not actively running apps, the CPU state goes to Deep Sleep faster and stays there.

Manufacturers will set the CPU governor at onDemand with cfq (I/O). This setting though it is sensitive to the increase of CPU load and gradually up/down its clock speed, however the setting tends to result in constant fluctuation of CPU speed; causing multi cores to run actively most of the time. Therefore it ends up  generating more heat and draining battery juices.

Set governor to UserSpace instead of originally at OnDemand.

After the above changes, performance very much stays within the same benchmark bracket (even with under-clocked to 1.5GHz from 1.6GHz, Redmi Note 4G) and now it is without heat generating problem for extended use. UI, browser and apps run much smoother than before due to reduced heat.
Games play tried out on Subway Surfers and Temple Run2 and running more smoothly. In fact it becomes harder to score high as the game speed is somewhat faster than before.

Try it out yourself. Remember to root your device first.