How to use the integrated GPU?

[sunbearc22]

What Operating System(s) are you running on?

Linux X11

Which Wayland compositor or X11 Window manager(s) are you using?

dpkg -l | grep mutter
ii  gir1.2-mutter-14:amd64                           46.2-1ubuntu0.24.04.14                    amd64        GObject introspection data for Mutter
ii  libmutter-14-0:amd64                             46.2-1ubuntu0.24.04.14                    amd64        window manager library from the Mutter window manager
ii  mutter-common                                    46.2-1ubuntu0.24.04.14                    all          shared files for the Mutter window manager
ii  mutter-common-bin                                46.2-1ubuntu0.24.04.14                    amd64        shared programs for the Mutter window manager

WezTerm version

20260117-154428-05343b38

Ask your question!

Why is the wezterm process appearing in the output of nvdia-smi when I instructed it to use the integrated GPU?

System's default renderer is a discrete Nividia GPU.; its integrated GPU (amdgpu) is not used.

Below algo is to allow me to choose which renderer I want to use for wezterm. Here I have set it to use the integrate GPU.

local renderer = "igpu"   -- possible values are igpu, dgpu or cpu
local gpus = wezterm.gui.enumerate_gpus()
wezterm.log_info("[BASE] renderer=" .. renderer)
for _, gpu in ipairs(gpus) do
  if gpu.device_type == "IntegratedGpu" then
    if renderer == "igpu" then  -- Integrated GPU
      config.webgpu_preferred_adapter = gpu
      config.front_end = "WebGpu"
      wezterm.log_info("[BASE] Preferred Adaptor: Integrated GPU.")
    end
  elseif gpu.device_type == "DiscreteGpu" then
    if renderer == "dgpu" then  -- Discrete GPU
      config.webgpu_preferred_adapter = gpu
      config.front_end = "WebGpu"
      wezterm.log_info("[BASE] Preferred Adaptor: Discrete GPU.")
    end
  elseif gpu.device_type == "Cpu" then
    if renderer == "cpu" then  -- CPU
      config.webgpu_preferred_adapter = gpu
      config.front_end = "Software"
      wezterm.log_info("[BASE] Preferred Adaptor: CPU.")
    end
  end
end

WezTerm log shows this:

8:36:03.878  INFO   logging > lua: [BASE] renderer=igpu
8:36:03.882  INFO   logging > lua: [BASE] Preferred Adaptor: Integrated GPU.

nvidia-smi process log shows:

|    0   N/A  N/A          115712      G   /usr/bin/wezterm-gui                      3MiB |
|    0   N/A  N/A          133386      G   /usr/bin/wezterm-gui                      3MiB |
+-----------------------------------------------------------------------------------------+

Output from wezterm.gui.enumerate_gpus():

> wezterm.gui.enumerate_gpus()
[
    {
        "backend": "Vulkan",
        "device": 11524,
        "device_type": "DiscreteGpu",
        "driver": "NVIDIA",
        "driver_info": "590.48.01",
        "name": "NVIDIA GeForce RTX 5060 Ti",
        "vendor": 4318,
    },
    {
        "backend": "Vulkan",
        "device": 5056,
        "device_type": "IntegratedGpu",
        "driver": "radv",
        "driver_info": "Mesa 25.2.8-0ubuntu0.24.04.1",
        "name": "AMD Ryzen 9 9900X 12-Core Processor (RADV RAPHAEL_MENDOCINO)",
        "vendor": 4098,
    },
    {
        "backend": "Vulkan",
        "device": 0,
        "device_type": "Cpu",
        "driver": "llvmpipe",
        "driver_info": "Mesa 25.2.8-0ubuntu0.24.04.1 (LLVM 20.1.2)",
        "name": "llvmpipe (LLVM 20.1.2, 256 bits)",
        "vendor": 65541,
    },
    {
        "backend": "Gl",
        "device": 0,
        "device_type": "Other",
        "driver_info": "3.3.0 NVIDIA 590.48.01",
        "name": "NVIDIA GeForce RTX 5060 Ti/PCIe/SSE2",
        "vendor": 4318,
    },
]

I have tried setting renderer="cpu" and wezterm log shows:

9:47:38.314  INFO   logging > lua: [BASE] renderer=cpu
9:47:38.319  INFO   logging > lua: [BASE] Preferred Adaptor: CPU.

However, the CPU is not used either as nvidia-smi still output:

|    0   N/A  N/A          157406      G   /usr/bin/wezterm-gui                    261MiB |
+-----------------------------------------------------------------------------------------+

$ dpkg -l | grep mesa
ii  libegl-mesa0:amd64                               25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the EGL API -- Mesa vendor library
ii  libegl-mesa0:i386                                25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the EGL API -- Mesa vendor library
ii  libegl1-mesa-dev:amd64                           25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the EGL API -- development files
ii  libgl1-mesa-dev:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        transitional dummy package
ii  libgl1-mesa-dri:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-dri:i386                             25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the OpenGL API -- DRI modules
ii  libglu1-mesa:amd64                               9.0.2-1.1build1                           amd64        Mesa OpenGL utility library (GLU)
ii  libglu1-mesa-dev:amd64                           9.0.2-1.1build1                           amd64        Mesa OpenGL utility library -- development files
ii  libglx-mesa0:amd64                               25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the OpenGL API -- GLX vendor library
ii  libglx-mesa0:i386                                25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the OpenGL API -- GLX vendor library
ii  mesa-libgallium:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        shared infrastructure for Mesa drivers
ii  mesa-libgallium:i386                             25.2.8-0ubuntu0.24.04.1                   i386         shared infrastructure for Mesa drivers
ii  mesa-utils                                       9.0.0-2                                   amd64        Miscellaneous Mesa utilities -- symlinks
ii  mesa-utils-bin:amd64                             9.0.0-2                                   amd64        Miscellaneous Mesa utilities -- native applications
ii  mesa-va-drivers:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        Mesa VA-API video acceleration drivers
ii  mesa-vdpau-drivers:amd64                         25.2.8-0ubuntu0.24.04.1                   amd64        Mesa VDPAU video acceleration drivers
ii  mesa-vulkan-drivers:amd64                        25.2.8-0ubuntu0.24.04.1                   amd64        Mesa Vulkan graphics drivers
ii  mesa-vulkan-drivers:i386                         25.2.8-0ubuntu0.24.04.1                   i386         Mesa Vulkan graphics drivers

Installed mesa packages are :

dpkg -l | grep mesa
ii  libegl-mesa0:amd64                               25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the EGL API -- Mesa vendor library
ii  libegl-mesa0:i386                                25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the EGL API -- Mesa vendor library
ii  libegl1-mesa-dev:amd64                           25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the EGL API -- development files
ii  libgl1-mesa-dev:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        transitional dummy package
ii  libgl1-mesa-dri:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-dri:i386                             25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the OpenGL API -- DRI modules
ii  libglu1-mesa:amd64                               9.0.2-1.1build1                           amd64        Mesa OpenGL utility library (GLU)
ii  libglu1-mesa-dev:amd64                           9.0.2-1.1build1                           amd64        Mesa OpenGL utility library -- development files
ii  libglx-mesa0:amd64                               25.2.8-0ubuntu0.24.04.1                   amd64        free implementation of the OpenGL API -- GLX vendor library
ii  libglx-mesa0:i386                                25.2.8-0ubuntu0.24.04.1                   i386         free implementation of the OpenGL API -- GLX vendor library
ii  mesa-libgallium:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        shared infrastructure for Mesa drivers
ii  mesa-libgallium:i386                             25.2.8-0ubuntu0.24.04.1                   i386         shared infrastructure for Mesa drivers
ii  mesa-utils                                       9.0.0-2                                   amd64        Miscellaneous Mesa utilities -- symlinks
ii  mesa-utils-bin:amd64                             9.0.0-2                                   amd64        Miscellaneous Mesa utilities -- native applications
ii  mesa-va-drivers:amd64                            25.2.8-0ubuntu0.24.04.1                   amd64        Mesa VA-API video acceleration drivers
ii  mesa-vdpau-drivers:amd64                         25.2.8-0ubuntu0.24.04.1                   amd64        Mesa VDPAU video acceleration drivers
ii  mesa-vulkan-drivers:amd64                        25.2.8-0ubuntu0.24.04.1                   amd64        Mesa Vulkan graphics drivers
ii  mesa-vulkan-drivers:i386                         25.2.8-0ubuntu0.24.04.1                   i386         Mesa Vulkan graphics drivers

[sunbearc22]

The above mentioned for-loops for config.webgpu_preferred_adapter seem to be working correctly again. Not sure why it did not work correctly previously, i.e. wezterm-gui always only appeared in the discrete-gpu. Below shows wezterm-gui running in the integrated-GPU.