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I want to disable my USB keyboard at boot time (in some scenarios) without modifying udev rules, as I know udev rules only works when a device is attached or detached from the target.

Is there any option in "udev.c" or in udev rules by which I can disable my USB keyboard at boottime?

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Modifying udev rules is actually the way to go. Udev rules are applied when the device is attached, but that includes devices that are already attached when the system boots: once udev has started, it applies all the rules to already-connected devices.

So write a udev rule that declares your keyboard as not authorized.

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