DRM KMS troubleshooting grid
Some typical issues related to the DRM/KMS framework are listed below. Solutions or debugging methods are proposed for these issues.
Board $> ./myQtApplication Could not queue DRM page flip! (Permission denied) Could not queue DRM page flip! (Permission denied)
The psplash-drm userland splash screen is running and is then the DRM master, avoiding other DRM applications to access to DRM/KMS. Please stop this psplash-drm application with the command below before running your use case:
Board $> psplash-drm-quit
Note: You may need to enter "export QT_QPA_EGLFS_ALWAYS_SET_MODE=1" before running your Qt application, please refer to the Qt documentation.
Direct Rendering Manager
Kernel Mode Setting