My Lenovo thinkpad T440s has the next product number:
$ cat /sys/class/dmi/id/product_name 20ARS0LF0A
So all the procedures show here are valid for this product
Fist and if you don’t install thinkfan, lm_sensors and hdapsd before:
$ sudo dnf install thinkfan hdapsd lm_sensors $ sudo sensors-detect $ sudo systemctl enable thinkfan
The next step is install tlp and prepare other tools for manage kernel modules:
sudo dnf install tlp tlp-rdw kernel-devel akmods kmodtool
We need to enable external repositories:
$ sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm $ sudo dnf install http://repo.linrunner.de/fedora/tlp/repos/releases/tlp-release-1.0-0.noarch.rpm
Now this is the last part of the installation, but read carefully this warning:
The next instructions are no recommended, we use the --nogpgcheck , so we not only use a external repository, we don’t check the sing the packages.
If you are comfortable with this just:
sudo dnf install akmod-tp_smapi akmod-acpi_call --enablerepo tlp-updates-testing --nogpgcheck
The --enablerepo tlp-updates-testing is necessary for fedora 25+ versions.
Now you can have a very well use and administration of your batteries 
Many thanks to linrunner and the TLP project.
Source From: fedoraplanet.org.
Original article title: Alberto Rodriguez (A.K.A bt0): Thinkpad T440s in Fedora.
This full article can be read at: Alberto Rodriguez (A.K.A bt0): Thinkpad T440s in Fedora.
