https://bugs.freedesktop.org/show_bug.cgi?id=73338
--- Comment #91 from Oliver Winker oliverml1@oli1170.net --- Ufff - a complicated way to recognize that one day I actually put the mod-param radeon dpm=0 :-P ... while in the meanwhile dpm=1 actually works ;).
Anyway, what a nice discovery: The fans are silent now! Great :)) !!