While testing recently cross-compiled Qt libraries (5.15.0) for Raspberry Pi 3 running ArchLinuxARM using a sample application (qopenglwidget) I received error:
Could not open DRM device /dev/dri/card0 (Permission denied)
It turned out the problem is easily solvable by adding the user runnning the application to the group "video":
$ sudo usermod -aG video alarm
(don't forget to logoff and login again for changes to take effect)
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