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defaults to disabled ( old way ) while still possible to enable and test the new way / code.
The newer code does not work good or does not work at all on some HW ( mine as example )
see:
https://lkml.org/lkml/2018/4/5/737
https://bugzilla.kernel.org/show_bug.cgi?id=198511
https://bugs.freedesktop.org/show_bug.cgi?id=105038
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