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jotasan 11-07-2013 04:04 PM

Fan control (noise) in Acer 5755g
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Hello community,

I have a Acer Aspire 5755g (64bits) with fedora 18. I bought it with Windows preinstalled, which lasted a mere couple of hours before changed it with fedora. The hardware specifications are in the 'lshw' and 'lspci' files attached

My issue is that, even with a temperature well below the 'high' threshold, the fan keeps quite noisy. not at its highest speed but still noticeable.

The short period I had Win 7 installed I think the noise level was much lower and I was wondering if there are problems with any of the chipset being not properly controlled temperature-wise.

For instance, right now with a temperature of 64C (given by # sensors) the noise is quite important

I followed some some steps on forums aimed to install lm_sensors and pwmconfig (to sense and control the chipsets) but this last one throws an error like 'There are no pwm-capable sensor modules installed. You can see of the sequence of commands below.
I know this could be a physical problem of the fan but I would like to rule out other issues before heading to the 'dreaded' pc repair shop..

Infinite thanks in advance!

[root@jotasanfed jotasanfed]# sensors-detect

**** Here, all Probing for hardware but everything appear as ....No*******

[root@jotasanfed jotasanfed]# cat /etc/sysconfig/lm_sensors
# Generated by sensors-detect on Thu Nov 7 21:26:09 2013
# This file is sourced by /etc/init.d/lm_sensors and defines the modules to
# be loaded/unloaded.
# The format of this file is a shell script that simply defines variables:
# HWMON_MODULES for hardware monitoring driver modules, and optionally
# BUS_MODULES for any required bus driver module (for example for I2C or SPI).


# For compatibility reasons, modules are also listed individually as variables
# MODULE_0, MODULE_1, MODULE_2, etc.
# You should use BUS_MODULES and HWMON_MODULES instead if possible.


[root@jotasanfed jotasanfed]# pwmconfig
# pwmconfig revision 5857 (2010-08-22)
This program will search your sensors for pulse width modulation (pwm)
controls, and test each one to see if it controls a fan on
your motherboard. Note that many motherboards do not have pwm
circuitry installed, even if your sensor chip supports pwm.

We will attempt to briefly stop each fan using the pwm controls.
The program will attempt to restore each fan to full speed
after testing. However, it is ** very important ** that you
physically verify that the fans have been to full speed
after the program has completed.

/sbin/pwmconfig: There are no pwm-capable sensor modules installed
[root@jotasanfed jotasanfed]#

TobiSGD 11-08-2013 08:59 AM

Most likely this is caused by one or both of these things:
- You don't have the proprietary Nvidia drivers installed, on your system together with Bumblebee for switching video chips. The free driver does not have sufficient power-management.
- You use the ondemand governor for your CPU, while it should be the pstate governor

I would start with installing the Nvidia driver and Bumblebee.

jotasan 11-08-2013 09:07 AM


I had bublebee and support for nvidia but it was causing even higher fan noise so I disabled nvidia from BIOS (don't really use it and is a really source of problems)

May I ask how to check onstate governor or pstate governor status?


TobiSGD 11-08-2013 11:28 AM

Sorry, I am not a Fedora user and Fedora does these things different as other distributions, AFAIK. Try to install cpufreq-utils and use the cpufreq-info tool to determine which governor is used.

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