This project is now deprecated in favor of Coolero. If you are still using GKraken, you are strongly advised to migrate to Coolero.
No new development is planned for GKraken and I do not own a Kraken device anymore, so I won't be able to provide even bug fixes.

GKraken is a GTK application that allows you to control the following AIO liquid coolers:

^L Limited functionality offered by legacy Kraken models

• How to get GKraken
  • Flathub
  • Source
• Running the App
  • Adding Udev rule
  • Command line options
• Building Flatpak
• Running tests
• FAQ
• How to help the project
• Acknowledgements
• License

Click here to see a short video of the application.

This is the preferred way to get GKraken on any major distribution (Arch, Fedora, Linux Mint, openSUSE, Ubuntu, etc).

If you don't have Flatpak installed you can find step by step instructions here.

Make sure to have the Flathub remote added to the current user:

flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

flatpak --user install flathub com.leinardi.gkraken

flatpak run com.leinardi.gkraken

plus all the Python dependencies listed in requirements.txt

If you have not installed GKraken yet:

git clone --recurse-submodules -j4 https://gitlab.com/leinardi/gkraken.git
cd gkraken
git checkout release
sudo -H pip3 install -r requirements.txt
meson . build --prefix /usr
ninja -v -C build
sudo ninja -v -C build install

If you installed GKraken from source code previously and you want to update it:

cd gkraken
git fetch
git checkout release
git reset --hard origin/release
git submodule init
git submodule update
sudo -H pip3 install -r requirements.txt
meson . build --prefix /usr
ninja -v -C build
sudo ninja -v -C build install

Once installed, to start it you can simply execute on a terminal:

gkraken

You can run the app from the desktop launcher or use the terminal:
Run the command gkraken if installed from source, or if installed with flatpak flatpak run com.leinardi.gkraken.

The app needs to access the USB interface of the Kraken that, normally, is not available to unprivileged users.

To allow normal users to access the Kraken's USB interface you can create a custom udev rule

Simply run:

gkraken --add-udev-rule

or with flatpak:

flatpak run com.leinardi.gkraken --add-udev-rule

It will automatically refresh also the udev rules. In some cases though, you may need to restart for the changes to take effect

Create a new file in /lib/udev/rules.d/60-gkraken.rules containing this text:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1e71", ATTRS{idProduct}=="170e", MODE="0666"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="1e71", ATTRS{idProduct}=="2007", MODE="0666"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="1e71", ATTRS{idProduct}=="3008", MODE="0666"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2433", ATTRS{idProduct}=="b200", MODE="0666"

After that, run the following commands

sudo udevadm control --reload-rules
sudo udevadm trigger --subsystem-match=usb --attr-match=idVendor=1e71 --action=add
sudo udevadm trigger --subsystem-match=usb --attr-match=idVendor=2433 --action=add

If you don't have Flatpak installed you can find step by step instructions here.

Make sure to have the Flathub remote added to the current user:

flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

git clone --recurse-submodules -j4 https://gitlab.com/leinardi/gkraken.git

It is possible to build the local source or the remote one (the same that Flathub uses)

./build.sh --flatpak-local --flatpak-install

./build.sh --flatpak-remote --flatpak-install

flatpak run com.leinardi.gkraken --debug

To run the tests install the test dependencies:

pip install -r test-requirements.txt

and run from the project directory:

pytest

To check the Linters run from the project directory:

mypy gkraken
pylint gkraken

To fix this issue install a Gtk theme from Flathub. This way, Flatpak applications will automatically pick the installed Gtk theme and use that instead of Adwaita.

Use this command to get a list of all the available Gtk themes on Flathub:

flatpak --user remote-ls flathub | grep org.gtk.Gtk3theme

And then just install your preferred theme. For example, to install Yaru:

flatpak install flathub org.gtk.Gtk3theme.Yaru

Production builds were previously distributed using PyPI. This way of distributing the software is simple but requires the user to manually install all the non Python dependencies like cairo, glib, appindicator3, etc.
A solution for all this problems is distributing the app via Flatpak, since with it all the dependencies will be bundled and provided automatically, making possible to use new GTK features also on distributions using an older version of Gnome.

No new build will be published on PyPI.

If you have already installed GKraken via pip, please make sure to uninstall it completely before moving to a newer version:

pip3 uninstall gkraken
rm -rf ~/.config/gkraken

If you want to help testing or developing it would be easier to get in touch using the Discord server of the project: https://discord.gg/Q33n3UC
Just write a message on the general channel saying how you want to help (test, dev, etc) and quoting @leinardi. If you don't use discor but still want to help just open a new issue here.

Something simple that everyone can do is to star it on both GitLab and GitHub. Feedback is always welcome: if you found a bug or would like to suggest a feature, feel free to open an issue on the issue tracker.

Thanks to:

• Jonas Malaco for the liquidctl CLI library
• @codifryed for adding support of many new Kraken devices!

This file is part of gkraken.

Copyright (c) 2021 Roberto Leinardi and Guy Boldon

gkraken is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

gkraken is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with gkraken.  If not, see <http://www.gnu.org/licenses/>.