[Trisquel-users] amdgpu is considered "open source", but how is it considered worthy of deblobbing by the Linux Libre kernel?

[tegskywalker]

I'm not trolling, just actually really curious about this one. AMD's amdgpu  
kernel driver is considered an "open source" version of their driver, and  
many improvements are in store for the 4.7 kernel like Polaris support.  
According to the Linux Libre kernel, it is considered non-free and therefore  
deblobbed.

How does this violate the free software guidelines? Is it like the upcoming  
Nouveau drivers for Nvidia where the code itself is "open source" but in  
reality it requires non-free code (additional firmware or a key or whatever)  
from the vendor in order to work?