modetest

The modetest utility, part of the libdrm package, enables querying display device capabilities, performing basic display tests, and configuring display modes.

Source code can be obtained from: https://dri.freedesktop.org/libdrm/libdrm-2.4.100.tar.bz2

To comppile:

./configure
make -j4

Upon successful compilation, the executable modetest will be generated under libdrm-2.4.100/tests/modetest.

Example Usage

Running modetest requires root privileges.

Example command:

./modetest -M vc4 -D 0 -a -s 32@140:1920x1080 -P 173@140:1920x1080 -Ftiles

This command outputs a full-screen gradient striped pattern via HDMI.

Use the --help flag to vieew all supported options:

./modetest --help

To list supported resolutions for the current platform:

modetest -M <platform_drm_name>

kmscube

Provided by Mesa3D, kmscube is a lightweight test application based on KMS/GBM/EGL/OpenGL ES 2.0. It operates with out X11 or Wayland, rendering graphics through DRM/KMS.

It leverages GBM, EGL, and OpenGL ES libraries from Mesa3D, and uses libdrm for DRM/KMS access. Thus, it demonstrates fundamental usage patterns for OpenGL, EGL, GBM, and DRM/KMS.

Download link: https://gitlab.freedesktop.org/mesa/kmscube

Compilation steps:

meson . build && ninja -C build

After compilation, the executable will appear in the build directory:

ls build/

To see available options:

./kmscube --help

Basic usage:

sudo ./kmscube -A -D /dev/dri/card0 -M smooth

Options explained:

• -A: Enables atomic mode for DRM/KMS
• -D: Specifies the device node (DRM/KMS and GPU share the same node)
• -M: Selects OpenGL rendering mode; valid options are: smooth, rgba, nv12-2img, nv12-1img