Newer Intel CPUs default to the intel_pstate driver.
The instel_pstate driver moves the control to the CPU. It doesn't directly control the stepping, it only sets the policy requirements. As a consequence there is no ondemand governor and there are different knobs in comparison to the acpi_cpufreq driver. Previously tuned knows only the cpufreq interface.
Support for intel_pstate driver was added into Tuned.
Tuned now detects the intel_pstate driver if in use, use it's knobs and doesn't try to set the unsupported governors.