Making the Macrosilicon MS2109 HDMI-to-USB capture device work on Linux

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I brought a cheap (£10) HDMI-to-USB2 capture device based on the Macrosilicon 2109 - but I encountered a problem where it didn't appear at /dev/video* when plugged in, despite dmesg showing some recognition of the device. Fortunately, Nikola_F on the Arch Linux forums had already found the problem and offered a solution: The device is wrongly being treated as a USB audio device. You can confirm…

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