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The reason why this USB HID device works in Windows is because there may be specific drivers written for it, the reason why it works for GRUB is that the device operates in so-called boot mode. USB HID devices support two modes of operation, boot mode and HID mode. The former makes it possible to use the device in BIOS without having BIOS implement a full ...


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I seem to recall that USB is a protocol that requires the computer to initiate the communication. It's not allowed to speak on its own. So the driver actually talks into the raw device and then captures the output. However, that's only a hunch, I'll also wait for another answer to confirm my suspitions.



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