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Graphics drivers (i915/Xe) have different sysfs knobs on different platforms, and it is possible that different sysfs knobs fit into the same turbostat columns. Instead of specifying different sysfs knobs every time, detect them once and cache the path for future use. No functional change. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>