Fan not detected by lm-sensors

My fan is blowing hard, while my cpu temperature is 32 degrees

I tried a lot of things to control my fan.

Changed grub file

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi= pci=noacpi"

_

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"Linux\""

Ran sensors-detect :

To load everything that is needed, add this to /etc/modules:
#----cut here----
# Chip drivers
coretemp
#----cut here----
If you have some drivers built into your kernel, the list above will
contain too many modules. Skip the appropriate ones!
Do you want to add these lines automatically to /etc/modules? (yes/NO)
Unloading i2c-dev... OK
Unloading i2c-i801... OK
Unloading cpuid... OK

Ran sensors:

acpitz-virtual-0
Adapter: Virtual device
temp1: +34.0°C (crit = +90.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +34.0°C (high = +80.0°C, crit = +90.0°C)
Core 2: +34.0°C (high = +80.0°C, crit = +90.0°C)

Ran sudo start module-init-tools and sudo start module-init-tools

module-init-tools stop/waiting

As you can see my fan isn't detected.

Running fancontrol gives me this:

Loading configuration from /etc/fancontrol ...
Error: Can't read configuration file

Can you help me, please? I cannot use my laptop now in class.

Thanks in advance.

My Ubuntu 11.10 system

00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 3 (rev 05)
00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
01:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 5400 Series]
01:00.1 Audio device: ATI Technologies Inc Manhattan HDMI Audio [Mobility Radeon HD 5000 Series]
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
03:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
7f:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 05)
7f:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 05)
7f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 05)
7f:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 05)
7f:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 05)
7f:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 05)

EDIT

Just installed Lubuntu and lm-sensors doesn't have any problems to detect my both my fans.

3 Answers

Before using fancontrol you have to generate a configuration using sudo pwmconfig from fancontrol package, which replace lm-sensors.

You may also find some relevant info at How to manage two video cards on a laptop (ATI and Intel)?

I know the source of my problem.

After installing Lubuntu I ran sensors and this was the output:

Adapter: Virtual device
temp1: +52.0°C (crit = +90.0°C)
radeon-pci-0100
Adapter: PCI adapter
temp1: +97.5°C

Then I installed the propietary fglrx driver. The output of sensors was only

Adapter: Virtual device
temp1: +52.0°C (crit = +90.0°C)

So, the ATI/AMD fglrx driver causes the problem.

When the sensors doesn't output the processor fan nowadays, you might try to reinstall the processor drivers, it worked for me and I was having huge problems with it.

Check out this answer for intel drivers: