@M4Z4 Hi, I'm not 100% sure I follow your launching process, but the error you're getting looks a lot like you are not setting the wayland display export in the same terminal as you run the QT application. Specifically, this part of the error message: Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl") Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: qt.core.plugin.factoryloader: checking directory path "/opt/cpx/platforms" ... Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: qt.core.library: "/usr/lib/plugins/platforms/libqwayland-egl.so" loaded library Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: Failed to create wl_display (Connection refused) Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: EGL: Warning: No default display support on wayland Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: qt.qpa.wayland: EGL not available Jan 13 11:55:32 sm2s-imx8mp cpx.sh[1628]: qt.qpa.plugin: Could not load the Qt platform plugin "wayland-egl" in "" even though it was found. The connection to the display screen is refused. It looks like either 1) Your path to the wayland display is wrong (check ls -l ${XDG_RUNTIME_DIR}/${WAYLAND_DISPLAY} before running your QT application) or 2) the user running QT does not have permissions. You should be able to see test applications like weston-flower work as well