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ps -o user= -C Xorgalso shows me as the user not root. I know the problem is udev related because if I create a uinput device and set too many UI_SET_KEYBITs for EV_KEY, the corresponding /dev/input/event file will still have the same permissions and group as the other ones but X11 drivers do not have the permission to read them. The Xorg log will show permission denied errors when opening the event file. If I put myself in input group or use less UI_SET_KEYBITs when creating uinput device, X11 can open the device.sudo evtestcan read the events just fine and linux console can interpret them correctly as well. X on the other hand gives permission denied errors.Xorg.wrapwrapper binary, located in/usr/lib/xorg/Xorg.wrap, at least on my Debian 11. See my edit above./usr/lib/Xorg.wrapand it is setuid! So that is how it has the privileges! But It doesn't explain why Xorg drivers show permission denied errors if the /dev/input/event device is weird like I explained in the above comments. How can it be run as root but not be able to read a device that has the same privileges as the others? It seems like something else determines if the device should be opened with root privileges or user privileges. That's why I suspected udev. Can this be related to systemd somehow? I'm really lost here.