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It's very annoying and I think it happened since last update, the fan of the CPU runs louder, that means probably faster than usual. It's really the CPU and not the NVIDIA fan. I already tried some things.

I modified grub config:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force acpi_osi=linux"
GRUB_CMDLINE_LINUX="acpi_enforce_resources=lax"

I read that the first one is for buggy BIOS, the second one was an issue with it87 kernel module. sensors-detect wanted me to load this module, but it was not loadable (modprobe it87 ended up with FATAL: Error inserting it87, so the second line solved it)

I also cleaned the fan and the CPU, although they were not that dusty, but didn't help either.

Although I want to get auto detection running again, I also tried to control it by fancontrol. But unfortunately, this won't work. I get...

PWM 255 FAN 0
Fan Stopped at PWM = 255
This fan appears to stop when the PWM is enabled;
perhaps the fan input shares a pin with the PWM output
on the sensor chip.
You cannot control this fan with this PWM output.

I already tried to load the previous kernel, but no result. By the way, my CPU usage is only at 4%, so there are no heavy processes running.

Output of sensors (I'm not sure why those ISA adapters have these strange values. Maybe it's a part of the problem?)

$ sensors
it8720-isa-0290
Adapter: ISA adapter
in0:          +0.00 V  (min =  +0.00 V, max =  +4.08 V)  ALARM
in1:          +1.63 V  (min =  +0.00 V, max =  +4.08 V)
in2:          +0.54 V  (min =  +0.00 V, max =  +3.06 V)
+5V:          +3.01 V  (min =  +0.00 V, max =  +4.08 V)
in4:          +4.08 V  (min =  +0.00 V, max =  +4.08 V)  ALARM
in5:          +4.08 V  (min =  +0.00 V, max =  +4.08 V)  ALARM
in6:          +4.08 V  (min =  +0.00 V, max =  +4.08 V)  ALARM
5VSB:         +3.95 V  (min =  +0.00 V, max =  +4.08 V)
Vbat:         +3.42 V  
fan1:        3375 RPM  (min =    0 RPM)
fan2:        1310 RPM  (min =    0 RPM)
fan3:        1303 RPM  (min =    0 RPM)
temp1:        +40.0°C  (low  =  -1.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +38.0°C  (low  =  -1.0°C, high =  -9.0°C)  sensor = thermistor
temp3:       -128.0°C  (low  =  -1.0°C, high = +127.0°C)  sensor = disabled
cpu0_vid:    +0.613 V
intrusion0:  OK

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +39.0°C  (high = +70.0°C)
                       (crit = +90.0°C, hyst = +88.0°C)

Any ideas?

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  • Check the temperature and fan speed with sensors, and boot from the livecd and try there to see if it is different.
    – psusi
    Mar 21, 2014 at 18:49
  • It's the same with a livecd and I extended the question by sensors data.
    – Bevor
    Mar 21, 2014 at 19:20
  • Then it doesn't look like it has anything to do with software. The bearings are probably going bad. Unless you changed any settings in the bios relating to the fan.
    – psusi
    Mar 21, 2014 at 19:21
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    You were right, it was the bearings. Changed the fan and it's much quieter although I'm not very satisfied with it, because it's much louder than my old one. Maybe I should get another one.
    – Bevor
    Mar 22, 2014 at 12:10
  • 3
    I'm voting to close this question as off-topic because it appeared to be a faulty hardware issue
    – Anwar
    Oct 14, 2016 at 17:31

1 Answer 1

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User Psusi was right, the bearing of the fan was broken (I felt it as I rotated the fan with the finger). I changed the fan, no noise anymore.

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