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I know this is a common problem and have read other topics but couldn't resolve. Anyways yesterday I found a solution - I have 2 graphic cards (hybrid) and they were both on. So I turned one off and installed Jupiter for power management and from there on the fans were quiet and I was happy as hell.

However (:)), yesterday evening I also updated the system and the fan and it's noise came back. I checked whether I am using only 1 graphics card and I am.

c0dehunter@mintBox ~ $ sudo lshw -c video
[sudo] password for c0dehunter: 
       description: VGA compatible controller
       product: RS780M/RS780MN [Mobility Radeon HD 3200 Graphics]
       vendor: Hynix Semiconductor (Hyundai Electronics)
       physical id: 5
       bus info: pci@0000:01:05.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:18 memory:c0000000-cfffffff ioport:c000(size=256) memory:fbcf0000-fbcfffff memory:fbb00000-fbbfffff

Maybe the problem is (false) temp reading from GPU?

c0dehunter@mintBox ~ $ sensors
Adapter: Virtual device
temp1:        +44.0°C  (crit = +105.0°C)

Adapter: PCI adapter
temp1:        +47.0°C  (high = +70.0°C)
                       (crit = +115.0°C, hyst = +110.0°C)

Adapter: PCI adapter
temp1:       +127.5°C  

The thing that is weird is that if I boot into Windows the fan is still at full power (previously it wasn't). Did I f--- up my hardware with software? :)

//OH, yes - I forgot to mention that my laptop is not hot at all. The temps are about 50°C.

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possible duplicate of Setting gpu fan speed using free ati driver? – bain Jul 26 '14 at 14:39
up vote 3 down vote accepted

This Ati fan control post worked for me in ubuntu and I also use this in Archlinux.

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From the answer I can't see where to paste this "alias"? – Primož Kralj Aug 12 '12 at 12:13
in your ~/.bashrc – duffydack Aug 12 '12 at 12:26

i have the same problem but when booting into windows i use the amd control software simply switch the fan control from auto to manual and auto again it dos it for me i have a xfx radeon HD 6670

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