CPU fan constantly running at max for long time

[Kasun Siyambalapitiya]

My laptop configurations are Dell 3521 Core i3 3227U @ 1.9Ghz 4GB RAM Intel HD4000 graphic + radeon HD7670m 1GB DDR3 dedicated graphics.

When I boot Elementary O Freya on my laptop, after some time CPU cooling fan starts to run continuously at max speed making a loud sound while the laptop is in idle state :( and also the air blown out side is not hot, just normal air. It will went on about 30 mins and then completely stops, It start again at max, when I try to watch a normal BRRIP movie, and though the movie player is closed, the fan rotate at its max for nearly another 30mins and stop.I Constantly updated my OS but nothing stops the fan running at max speed. So I thought that Open source driver is the problem so I tried fglrx-updates proprietary driver through the additional hardware and I choose power save from catalyst control center. But still the same problem exists. Please help me, I had this problem over a year now, and I have been changing from Ubuntu 12.04,Ubuntu 14.04,Ubuntu 14.04.2,Ubuntu 15.04 they all had the same problem, that why I tried Elementary OS. Really I love Elementary OS Freya and don't want to go back Windows or no noisy Ubuntu.Please help me to use Elemnetary OS Freya in my laptop

[Angelo Bartolome (barklome)]

Hi!

You could try install i8kutils package

[Kasun Siyambalapitiya (kasun-siyambalapitiya)]

I tried it. But it stopped the fan, just like freezing it. And afterwards the fan did not ran though I run load on CPU( which surely the fan must run). So i removed i8kutil package. Any more solutions, I think this is a driver failure as when I boot in windows fan is running normally

[kay van der Zander (kay20)]

Hey Kasun and Angelo,

This problem is a kernel problem There are thermal zones defined on boot.
The kernel should be managing this proper for you laptop.
This can be adjusted but it would require every time you boot to run the script again.
or let it auto execute on boot.

to be able to make the script for you. i need more information.
i need all the files in /sys/class/thermal/ and /sys/class/hwmon/
because there are some triggers in the kernel which makes the laptop cooling system run on certain levels.

[Kasun Siyambalapitiya (kasun-siyambalapitiya)]

Here are my results

/sys/class/thermal/

cooling_device0 cooling_device2 cooling_device4
cooling_device1 cooling_device3 thermal_zone0

/sys/class/hwmon/

bash: /sys/class/hwmon/: Is a directory