Hello!
Hardware: ITX-3588J and two monitors
Software:
Ubuntu 20.04.4 LTS (GNU/Linux 5.10.66 aarch64)
Qt version 5.12.8 installed on ITX-3588J by: sudo apt-get install build-essential qt5-default
X.Org X Server 1.20.8
When we trying to run a qt application with QOpenGLWidget on two monitors (the window has a size 3840x1080), there were problems.
First scenario (Used eglfs):
sudo killall -3 gnome-shell
export QT_QPA_PLATFORM=eglfs
export QT_QPA_EGLFS_INTEGRATION=eglfs_kms
export QT_QPA_EGLFS_KMS_ATOMIC=1
export QT_QPA_EGLFS_KMS_CONFIG=/home/firefly/kms_config.json
./ZeroCopyGLSample
kms_config.json are:
{
"device": "/dev/dri/card0",
"outputs": [
{
"name": "HDMI1",
"mode": "1920x1080"
},
{
"name": "HDMI2",
"mode": "1920x1080"
}
]
}
Everything starts and works well, except that the application can only use one monitor, although qApp→screens() correctly returns both devices. Attempts to create widgets with the geometry of the second monitor did not give the expected result.
Second scenario (Used Xserver):
xinit /home/firefly/testapps/OpenGL/ZeroCopyGLSample/ZeroCopyGLSample
The application starts, a window is created on two monitors, but OpenGL does not work correctly:
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
QOpenGLWidget: Failed to create context
I would be grateful for any hint
Thanks for the help!