Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
Could not open DRM (NV) device
I'm trying to run a Qt example and I face the following issue :
root@bandito:/home/Qt# ./animation -platform eglfs QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/var/volatile/tmp/runtime-root' Could not open DRM (NV) device Aborted
Can anyone help me figure out what's wrong?
Here are my environment variables :
QT_QPA_FB_DRM=1 QT_QPA_EGLFS_KMS_ATOMIC=1 QT_QPA_EGLFS_INTEGRATION=eglfs_kms_egldevice QT_QPA_EGLFS_FB=/dev/dri/card0 QT_QPA_EGLFS_ALWAYS_SET_MODE=1
Hi and welcome to devnet,
Are you running your code on an embedded device ?
Does it have any other graphics system running like an a X server or wayland ?
Hi @SGaist ,
Yes, I'm running my app on an embedded device.
I'm not using XServer nor Wayland.
I'have noticed that I missed an option during the confirguration of Qt.
Among egldeviceintegration libraries, there is only :
It seems that I should have enabled gbm. But I need to dig deep to understand how the linux graphical stack works to put everything together.
Okay, I was able to solve the issue by adding
gbm( Generic Buffer Management ) among the configurations options passed to the
configurescript of Qt.
This allowed me to obtain among the egl device integrations shared libraries :
After that, setting up
QT_QPA_EGLFS_KMS_CONFIGenvironment variables to my
I was able to run my application properly.
I probably need to spend more time understanding the linux graphical stack to put everything together in my mind, but for now the application is running and I can continue the development.
Hope it helps someone.
Bye Bye !
Nice ! Thanks for sharing the findings :-)