Lenovo T61p temperatur​es

Question

Hellp again fellow community members!
First of all I would like to wish all of you a happy new year!
So, I wrote here again, because I have some concerns with laptops and their temps. Ever since I changed my CPU from T7700 -> T9300 C2D on my Lenovo T61p, but after this, the temps have gone down way too much! What I mean is, that before when I used the laptop, idle CPU temps were at 40C and GPU at 48C. Now, the GPU is about the same, but the CPU temps are too too low, from 40C --> 26C. Is this normal? CPU Usage is the same, around 2-10%.
I did change the thermal paste and clean out the dust though, there was no dust!
I have used many many laptops, old, new and from different companies but I have NEVER seen such low temps, EVER! Even on my desktop!!!
Should I worry? 
Hello! I use a Lenovo T61P in every day!

Answer 1

Bios mode disables all fan controls, smart mode lets the app control the fan and it can be tweaked to give you better cooling or to avoid fan noise depending on your preference. Most use smart mode. Manual mode allows you to set the speed and to run the fan constant, this is generally only good for testing or specific type of use like if you want to run the fan constant at a slow speed instead of having it cycle on at high speed then off again. This can be handy if you're using your laptop while someone is sleeping next to you, the constant slow speed won't disturb someone as much as the on/off. In manual mode it will re-engage control if the temps reach a dangerous level to prevent overheating.
Your results confirm that your laptop is running cooler than most, this could be a good thing and most likely it's because you're not stressing the cpu/gpu chips enough to get the temps up. You can try playing games or watching videos with a player that uses the discrete gpu or you can run a GPU stress test to get the temps up. I use Furmark, it's a free GPU stress test app. When you start it hit the "space bar" to disable the fuzzy donut which isn't required to stress a laptop gpu, it's only needed for a gaming computer many of which have multiple GPUs. When stressed in smart mode you should see the fan coming on when the temp of the CPU and GPU reach 60 to 65c. Temps below this won't engage the fan. With heavy use temps upto mid 80s aren't abnormal and once you get over mid 90s you risk thermal shutdown to prevent damage. 
Some factors regarding temp are the room temp and humidity where it's used. If your room is cool and dry the laptop will run a lot cooler. In hot humid climates you'll see a well tuned laptop reaching 60c pretty quickly under moderate use and with cool dry air and light use you may not need the fan at all so I suspect that is what you're experiencing. Cool is usually always better as long as your laptop is working properly and performing well. The stress test I recommend should get your temps up so you can be sure it's working properly and you'll see the fan working properly if it engages when you hit about 60-65c. 
The test can also be used to demonstrate the health of your gpu, with the fan on manual mode speed 7 you should see a nice level graph for gpu temp in furmark. This is one example when the manual mode is useful so the changes in fan speed won't change the gpu temp and you can see the chips temps when running at max with max cooling.
In summary I'm inclined to think you have a very efficient cooling system, but these tests will help confirm that.
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