https://bugs.freedesktop.org/show_bug.cgi?id=91375
--- Comment #10 from Alex Perez aperez@alexperez.com --- I also get the "[drm:.si_dpm_set_power_state] *ERROR* si_restrict_performance_levels_before_switch failed"
...with 4.12.4, on Big Endian based powerpc64 machine (debian sid userland)