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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
This is a most excellent place for technology news and articles.
There are a lot of passive adapters out there that seem like black magic at first.
Obviously has drawbacks, but you can also do displayport/hdmi to VGA passively.
That is not passive, they have to "translate".
Oh, you may have got me.
By passive, I was trying to say that no external power/additional connection/etc is required. But, the port is technically powered and that is enough to make it not passive.