This says post-skylake, but both my SKX workstation and i5-6200U laptop have 1 in /sys/bus/event_source/devices/intel_pt/caps/psb_cyc which seems to be the cond

This says post-skylake, but both my SKX workstation and i5-6200U laptop have 1 in /sys/bus/event_source/devices/intel_pt/caps/psb_cyc which seems to be the condition, though I haven't tried to use it.