I went all the way back to the USB 1.0 spec, but even it says “The Hub and Port Status Change Bitmap size varies from a minimum size of one byte. Hubs only report as many bits as there are ports on the hub, subject to the byte-granularity requirement” (section 11.8.3)
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Ah okay, I thought that was new in 2.0 but everyone just does the minimum anyhow.
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