Seamless boot/fastboot on AMD Raven

[Paul Menzel]

Dear AMD folks,


On a system with AMD Ryzen 3 2200G [1] (RX Vega 8, Raven, 
0x1002:0x15dd), Linux 5.10 still makes a modeset between entering the 
LUKS passphrase and GDM graphical login manager. Is there a way to use 
the firmware resolution, which is efifb also uses? I think, AMD’s term 
for that is *seamless boot*, and Intel calls it *fastboot* 
(`i915.fastboot=1`).


Kind regards,

Paul


[1]: https://en.wikipedia.org/wiki/List_of_AMD_Ryzen_processors#APUs_2