After some more testing it turned out that adding "video=radeonfb:off"
to the kernel command line fixes the problem and makes modesetting
work on the Mac Mini G4.

The driver is actually blacklisted by default:

root@test-adrian1:~# grep radeonfb /etc/modprobe.d/*
/etc/modprobe.d/fbdev-blacklist.conf:blacklist radeonfb
root@test-adrian1:~#

However, it's still loaded before the actual root filesystem is mounted
and is later unloaded. Even after then, modesetting doesn't work after
loading the "radeon" module.

So, radeonfb has to be prevented from loading from earlier on, probably
by disabling it in the kernel configuration or blacklisting it in the
initrd.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - [email protected]
`. `'   Freie Universitaet Berlin - [email protected]
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913


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