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+Calibration
+-----------
+
+When you run powertop the first time (or second time), you might see
+the following message:
+
+> Loaded 100 prior measurements
+> Cannot load from file /var/cache/powertop/saved_parameters.powertop
+> File will be loaded after taking minimum number of measurement(s) with battery only
+
+This is not a bug. As the messages shown, you have to run powertop and
+wait it to collect enough data in order to create the
+saved_parameters.powertop file. Depending on the system, the maximum
+requirement is 2250 measurements. The process may take one or two
+hours.
+
+Do not rename `/var/cache/powertop/saved_results.powertop to
+saved_parameters.powertop.
+
+While this silence the program, it is not correct. The parameters are
+models to improve the prediction of power consumption. Try running the
+program longer while doing your normal workload.
+
+See also: the -c, --calibrate option in manpage powertop(8)
+
+Automatically run --auto-tune at system boot time
+-------------------------------------------------
+
+This package ships a systemd unit to run --auto-tune automatically at
+system boot time or when it resumes after a suspend/hibernate. To
+enable the unit run:
+
+    systemctl enable --now powertop
+
+Note some devices may become nonfunctional with auto-tune options. For
+example some USB devices does not handle auto-suspend very well.
+
+
+ -- Kan-Ru Chen (陳侃如) <koster@debian.org>, Mon, 16 Aug 2021 14:50:52 +0900