Archiv für den Monat: April 2015

Temperature Control on Dell Latitude E7440 under Ubuntu 14.04.2 LTS

I collect many informations how to control the fans under ubuntu now. Here is what works for me at the moment.


1st Problem: Without additional fan-control tool my Dell Latitude E7440 runs quiet until a special temeperature and then speeds up the fan to full speed forever.

2nd Problem:With i8kmon installed and the service started, the fan-control lasts only a few seconds and is then controled again from BIOS.

3rd Problem: With fan-control tool i8kmon installed with default settings my Latitude runs very quiet the whole time. But because dell has a CPU-Throttling-Policy which you are not able to control, the Latitude runs until a special temperature and then the BIOS scales down the CPU to the minimum frequency. The result is a freezing Desktop until the temperature cools down to a ridiculously low point at about 45°C.


1st: Install i8kutils and lm-sensors
sudo apt-get install i8kutils lm-sensors

2nd: Disable BIOS-Fan-Control (Without Warranty)
sudo apt-get install gcc-4.6-multilib
(on 16.04 I need to change the above line to „sudo apt-get install gcc-multilib„)
cd ~
mkdir .bin
cd .bin
sudo apt-get source i8kutils
sudo apt-get build-dep i8kutils
tar xf i8kutils_1.41.tar.xz
cd i8kutils-1.41
gcc -g -O2 -Wall -I. -o smm -m32 smm.c
sudo ./smm 30a3
sudo cp smm /usr/sbin/

In the next step, we setup i8kmon to stop the bios-fan-control automatically
sudo nano /etc/init.d/i8kmon

Find the following:
case „$1“ in
            log_daemon_msg „Starting $DESC“ „$NAME“

And change it into:
case „$1“ in
        /usr/sbin/smm 30a3
            log_daemon_msg „Starting $DESC“ „$NAME“

In the same file find the following:
        log_daemon_msg „Stopping $DESC“ „$NAME“

And change it into:
        /usr/sbin/smm 31a3
        log_daemon_msg „Stopping $DESC“ „$NAME“

This will disable Bios-Fan-Control directly while starting i8kmon. And enable it while shutting down the service i8kmon.

3rd: To prevent scaling down the CPU edit the configuration of i8kmon
find the example-file i8kmon.conf
sudo find / -name ‚i8kmon.conf‘

In my case i find the file in my user-home: /home/rod/.bin/i8kutils-1.41/i8kmon.conf
Now copy the file to /etc/i8kmon.conf. Change your directoryname!
cp /home/rod/.bin/i8kutils-1.41/i8kmon.conf /etc/

Modify the file with nano:
sudo nano /etc/i8kmon.conf

Change to the following:

# Automatic fan control, override with –auto option
set config(auto)        1

# Automatic fan control, override with –auto option
set config(auto)        1

set config(0)  {{-1 0}  -1  30  -1  30}
set config(1)  {{-1 0}  30  50  30  50}
set config(2)  {{-1 1}  45  60  45  60}
set config(3)  {{-1 2}  55 128  55 128}

# end of file

The last block in this file controls the fan-speed based on temperatures. Here is how to read the block:
{{ -1 0} -1 30 -1 30}
{{ first_fan_speed second_fan_speed} low_temp_on_ac high_temp_on_ac low_temp_on_bat high_temp_on_bat}

Because the Dell Latitude has no first fan, we can setup the first fan always to „-1“

The temperatures are the first test now. I will Update this post after gathering some experience.

KODI 14.2 stops playing Amazon Prime Videos

After normal upgrading my Ubuntu, Amazon Prime Addon in Kodi suddenly stops working. There was no error-message shown in kodi at all, it just happens nothing after starting a movie.

After some log review i found an error in kodi.log under „~/.kodi/temp“ that says: „ERROR: Unable to load“

Thats the reason. Just install the package and enjoy again Amazon Prime movies.

sudo apt-get install librtmp1