https://bugs.freedesktop.org/show_bug.cgi?id=68235
--- Comment #10 from Alexandre Demers alexandre.f.demers@gmail.com --- If ret=1 just after ni_restrict_performance_levels_before_switch(), ni_dpm_set_power_state() doesn't go any further and there is no hang. So, it seems like if the problem is not with ni_restrict_performance_levels_before_switch() but instead with a combination of some sort.