Where Does powertop Store Calibration Data?
powertop keeps calibration cache in /var/cache with reports wherever specified. First-run missing-file warnings are normal.
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powertop caches calibration in system paths with reports wherever specified. Measurements pair with power models under one cache tree. First-run warnings about missing files are normal.
Fallback paths cover unwritable caches per source code. Tunables apply through flags rather than files. Calibrate on battery for representative models.
Where powertop stores this, by platform
/var/cache/powertop
Calibration cache with measurements plus power models. Reports save to invocation-chosen paths. Missing warnings on first runs are expected.
Frequently asked questions
How do I back up powertop data?
Let calibration populate /var/cache/powertop through battery runs or force it with calibrate flags. Reports save to chosen paths per invocation. Missing-file warnings on first runs are expected, not bugs.
Results versus parameters files?
They pair per role with measurements beside power models. Fallback paths cover unwritable caches per source. Never symlink one to the other despite similar names.
Does powertop need root?
It needs root throughout with USB and radio cycling during runs. Leave the machine alone while calibrating. Tunables apply separately through auto-tune flags.
Notice an outdated path? Let us know.