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.

If your issue is not listed, try also looking in the articles in the DRM/KMS or troubleshooting grids categories.


Symptom Resolution
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

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