https://bugzilla.kernel.org/show_bug.cgi?id=65761
--- Comment #42 from Christoph Haag haagch.christoph@googlemail.com --- 0:DIS: :DynOff:0000:01:00.0 1:IGD:+:Pwr:0000:00:02.0
Nice. It now powers off properly in X.
I haven't extensively tried but with the latest mesa git and this patch this bug seems to have vanished too: https://bugs.freedesktop.org/show_bug.cgi?id=69101 https://bugs.kde.org/show_bug.cgi?id=324864