Linux AMDGPU Control Application

This application allows you to control your AMD or Nvidia GPU on a Linux system.

GPU info	Overclocking	Fan control
Historical data

Current features:

• Viewing information about the GPU
• Power and thermals monitoring, power limit configuration
• Fan curve control
• Overclocking (GPU/VRAM clockspeed and voltage, currently AMD only)
• Power states configuration (AMD only)

Both AMD and Nvidia functionality works on X11, Wayland or even headless sessions.

Installation

• Arch Linux: Install the AUR Package (or the -git version)

• Debian/Ubuntu/Derivatives: Download a .deb from releases.

  It is only available on Debian 12+ and Ubuntu 22.04+ as older versions don't ship gtk4.

• Fedora: use the Copr repository, or download an RPM from releases.
• Gentoo: Available in GURU.

• OpenSUSE: an RPM is available in releases.

  Only tumbleweed is supported as leap does not have the required dependencies in the repos.

• NixOS: There is a package available in nixpkgs
• Otherwise, build from source.

Why is there no AppImage/Flatpak/other universal format? See here.

Note: Nvidia support requires the Nvidia proprietary driver with CUDA libraries installed.

Development builds

To get latest fixes or features that have not yet been released in a stable version, there are packages built from the latest commit that you can install from the test release or using the lact-git AUR package on Arch-based distros.

Note: the date of the test release is not the date when the packages were built, the actual date is specified next to the attached package files.

Usage

Enable and start the service (otherwise you won't be able to change any settings):

sudo systemctl enable --now lactd

You can now use the GUI to change settings and view information.

Hardware support

AMD

LACT for the most part does not implement features on a per-generation basis, rather it exposes the functionality that is available in the driver for the current system. However the following table shows what functionality can be expected for a given generation.

• Supported - the functionality is known to work
• Limited - the functionality is known to work, but has certain limitations
• Untested - the functionality has not been confirmed to work, but it should
• Unknown - the functionality has not been confirmed to work, and it is unknown if it does
• Unsupported - the functionality is known to not work

GPUs not listed here will still work, but might not have full functionality available. Monitoring/system info will be available everywhere. Integrated GPUs might also only have basic configuration available.

Nvidia

Anything Maxwell or newer should work, but generation support has not yet been tested thoroughly.

Configuration

There is a configuration file available in /etc/lact/config.yaml. Most of the settings are accessible through the GUI, but some of them may be useful to be edited manually (like admin_groups to specify who has access to the daemon)

Socket permissions setup:

By default, LACT uses either ether the wheel or sudo group (whichever is available) for the ownership of the unix socket that the GUI needs to connect to.

On most configurations (such as the default setup on Arch-based, most Debian-based or Fedora systems) you do not need to do anything.

However, some systems may have different user configuration. In particular, this has been reported to be a problem on OpenSUSE.

To fix socket permissions in such configurations, edit /etc/lact/config.yaml and add your username or group as the first entry in admin_groups under daemon, and restart the service (sudo systemctl restart lactd).

Overclocking (AMD)

The overclocking functionality is disabled by default in the driver. There are two ways to enable it:

• By using the "enable overclocking" option in the LACT GUI. This will create a file in /etc/modprobe.d that enables the required driver options. This is the easiest way and it should work for most people.

  Note: This will attempt to automatically regenerate the initramfs to include the new settings. It does not cover all possible distro combinations. If you've enabled overclocking in LACT but it still doesn't work fter a reboot, you might need to check your distro's configuration to make sure the initramfs was updated. Updating the kernel version is a guaranteed way to trigger an initramfs update.

• Specifying a boot parameter. You can manually specify the amdgpu.ppfeaturemask=0xffffffff kernel parameter in your bootloader to enable overclocking. See the ArchWiki for more details.

Suspend/Resume

As some of the GPU settings may get reset when suspending the system, LACT will reload them on system resume. This may not work on distributions which don't use systemd, as it relies on the org.freedesktop.login2 DBus interface.

Building from source

Dependencies:

• rust 1.76+
• gtk 4.6+
• git
• pkg-config
• make
• hwdata
• libdrm
• blueprint-compiler 0.10.0+ (Ubuntu 22.04 in particular ships an older version in the repos, you can manually download a deb file of a new version)

Command to install all dependencies:

• Fedora: sudo dnf install rust cargo make git gtk4-devel libdrm-devel blueprint-compiler
• Arch: sudo pacman -S --needed base-devel git make rust gtk4 hwdata blueprint-compiler

Steps:

• git clone https://github.com/ilya-zlobintsev/LACT && cd LACT
• make
• sudo make install

It's possible to change which features LACT gets built with. To do so, replace the make command with the following variation:

Headless build with no GUI:

make build-release-headless

Build GUI with libadwaita support:

make build-release-libadwaita

API

There is an API available over a unix or TCP socket. See here for more information.

Remote management

It's possible to have the LACT daemon running on one machine, and then manage it remotely from another.

This is disabled by default, as the TCP connection does not have any authentication or encryption mechanism! Make sure to only use it in trusted networks and/or set up appropriate firewall rules.

To enable it, edit /etc/lact/config.yaml and add tcp_listen_address with your desired address and in the daemon section.

Example:

daemon:
  tcp_listen_address: 0.0.0.0:12853
  log_level: info
  admin_groups:
  - wheel
  - sudo
  disable_clocks_cleanup: false

After this restart the service (sudo systemctl restart lactd).

To connect to a remote instance with the GUI, run it with lact gui --tcp-address 192.168.1.10:12853.

CLI

There is also a cli available.

• List system GPUs:

  lact cli list-gpus

  Example output:

  1002:687F-1043:0555-0000:0b:00.0 (Vega 10 XL/XT [Radeon RX Vega 56/64])

• Getting GPU information:

  lact cli info

  Example output:

  lact cli info
  GPU Vendor: Advanced Micro Devices, Inc. [AMD/ATI]
  GPU Model: Vega 10 XL/XT [Radeon RX Vega 56/64]
  Driver in use: amdgpu
  VBIOS version: 115-D050PIL-100
  Link: LinkInfo { current_width: Some("16"), current_speed: Some("8.0 GT/s PCIe"), max_width: Some("16"), max_speed: Some("8.0 GT/s PCIe") }

The functionality of the CLI is quite limited. If you want to integrate LACT with some application/script, you should use the API instead.

Reporting issues

When reporting issues, please include your system info and GPU model.

If you're having an issue with changing the GPU's configuration, it's highly recommended to include a debug snapshot in the bug report. You can generate one using the option in the dropdown menu:

The snapshot is an archive which includes the SysFS that LACT uses to interact with the GPU.

If there's a crash, run lact gui from the command line to get GUI logs, check daemon logs in journalctl -u lactd for errors, and see dmesg for kernel logs that might include information about driver and system issues.

Other tools

Here's a list of other useful tools for AMD GPUs on Linux:

• CoreCtrl - direct alternative to LACT, provides similar functionality in addition to CPU configuration with a Qt UI
• amdgpu_top - tool for detailed real-time statistics on AMD GPUs
• Tuxclocker - Qt overclocking tool, has support for AMD GPUs