I'm trying to watch Amazon Prime Video on my Arch Linux, but it forces the video quality to SD.

With Amazon support I was informed that this happens in cases where there's no HDCP supported.

I'm pretty sure this is not a hardware problem, because Prime Video works just fine in Windows 10.

Where can I find what kind of HDCP is supported on Linux, and with which hardware/drivers?

Are there any browser plugins that could help?

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    It would be helpful if you told us which hardware, drivers, and distro you're using. It may be that there isn't a standard way to query this information and whatever information someone gave you would depend on those factors. – bk2204 Jan 11 at 3:25
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    Do you have a mei_hdcp driver? See kernel.org/doc/html/latest/driver-api/mei/hdcp.html – fpmurphy Jan 11 at 6:11

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