I confirm that the RX580 does not have framebuffer/KMS support with the ATI driver. There is KMS support with the AMDGPU driver, sadly it requires some proprietary blob :(
During the Guix days you mentioned that you went for KMSCON because of encoding issues if I recall correctly. So what about this: on startup, test if KMS is supported. If not, fall back to the default TTY, and too bad for the limited encoding :p Would that work? -- Pierre Neidhardt https://ambrevar.xyz/
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