Information about intel_pstate active mode is added in the doc. This operation mode could be used to set on the hardware when it's not activated. Status of the mode could be checked from sysfs file i.e., /sys/devices/system/cpu/intel_pstate/status. The information is already available in cpu-freq/intel-pstate.txt documentation. Link: https://www.kernel.org/doc/Documentation/cpu-freq/intel-pstate.txt
Created attachment 304190 [details] Documentation update patch information
Please find the maintainer of this subsystem and send the patch to them directly. CC'ing LKML would be nice as well.
Actually never mind, this bug report is already in the corresponding mailing list.