Xectich wrote:
I checked the task manager and nothing unusual. It went from silent to loud, but nothing changed in the cpu % usage in the task manager and the heat of the CPU was around 40C and proccesor usage was aprox. 3-4% tops at the time i was monitoring it, so I assume it`s not from a backgroud app that is running =\ [ tested it with only chrome and task manager oppened from a fresh boot]. Anything else I might try?
This isn't a mystery causing the fan to increase and decrease, it is increasing and decreasing in speed due to temperature sensor change showing an increase in heat, that triggers the fan to increase in speed, and when the temperature goes down and the sensor shows this decrease, the fan is slowed down.
It is possible that the JZ fan map has a trigger point very close to your idle temperature, so a small increase / decrease causes it to spin up and down. The JH has this problem.
This is a known issue for the JH, like your JZ, except the JZ is also using the Intel CPU onboard GPU - which may mask the cause of this problem because the increased GPU usage may not show in the Task Manager - it may come from GPU requests from the OS or other processes that won't register as CPU usage in the Task Manager.
I don't have an Optimus G750 yet, so I can't research this, but one of the first things I would do is to set every tweak I can find to force use of the Nvidia GTX GPU instead of the Intel CPU/GPU. To reduce the GPU heat load on the CPU and CPU cooler.
It is a known problem with the G750JH that the fan curve is such that near idle the CPU fan can be triggered at the slightest increase in CPU usage - browser refresh, opening folders, etc. The solution was to reduce the voltage to the CPU which brought the heat down enough to be below that trigger point. It solved the problem for me, and I only had to set the voltage offset to -25mV for CPU/CPU cache with XTU.
Try that with the JZ, along with finding all the processes using the Intel GPU and setting them to use the Nvidia GPU, maybe you can cure the problem on the JZ, maybe not.
This might reveal Intel GPU usage, but I can't test it, please give it a try and let us know if it is useful:
Using Intel® Graphics Performance Analyzer (GPA) to analyze Intel® Media Software Development Kit-enabled applications
https://software.intel.com/en-us/articles/using-intel-graphics-performance-analyzer-gpa-to-analyze-i...
Download pdf
https://software.intel.com/sites/default/files/m/d/4/1/d/8/intelmsdk_gpa.pdf
Download monitoring, analyzing, server, app
https://software.intel.com/en-us/vcsource/tools/intel-gpa
Installing creates a systray icon that allows you to start analyzers that connect to the server monitoring the GPU/CPU. I don't get the GPU options on my JH, only the CPU options:
What do you see on your Intel GPU enabled system?
Xectich wrote:
These are the proccesses that were running and causing CPU usage at the time the fan kick started and I have no idea what is causing it to speed up 😞 :
Chrome allocates a new process for every tab, and it looks like 4 tabs were active during that snapshot of the task manager. The CPU usage of those 4 tabs is 12% of all 8 cores, and that means they were taking 1 entire CPU core, which is 100% of 1 CPU core, that's a lot of CPU. 8 cores x 12.5% = 100%
For me, I use firefox, with a number of extensions and tuning to stop reloading tabs, or other background stealers of CPU, like ad's constantly reloading / flipping / etc. chrome has such extensions and tuning too.
You will need to figure out what is running on those tabs that is causing the CPU usage.
At this point, to stop the fan, quit Chrome 🙂
Now you know what is causing the problem, you only need to learn how to control and fix it.
Here are my minimal Firefox extensions to keep things from taking CPU, my private data, and wasting my time forcing ads in my face.
