我启用了 powertop 服务。它总是显示以下内容：
$ sudo systemctl status powertop -l
○ powertop.service - Extend the battery life of laptop
Loaded: loaded (/lib/systemd/system/powertop.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Wed 2022-11-02 17:39:20 CET; 2min 4s ago
Process: 192272 ExecStart=/usr/sbin/powertop --auto-tune (code=exited, status=0/SUCCESS)
Main PID: 192272 (code=exited, status=0/SUCCESS)
CPU: 3.266s
Nov 02 17:39:15 lamy powertop[192272]: glob returned GLOB_ABORTED
Nov 02 17:39:18 lamy powertop[192272]: Leaving PowerTOP
Nov 02 17:39:20 lamy powertop[192272]: Cannot load from file /var/cache/powertop/saved_parameters.powertop
Nov 02 17:39:20 lamy powertop[192272]: File will be loaded after taking minimum number of measurement(s) with battery only
Nov 02 17:39:20 lamy powertop[192272]: Cannot load from file /var/cache/powertop/saved_parameters.powertop
Nov 02 17:39:20 lamy powertop[192272]: File will be loaded after taking minimum number of measurement(s) with battery only
Nov 02 17:39:20 lamy powertop[192272]: To show power estimates do 113 measurement(s) connected to battery only
Nov 02 17:39:20 lamy systemd[1]: powertop.service: Deactivated successfully.
Nov 02 17:39:20 lamy systemd[1]: Finished Extend the battery life of laptop.
Nov 02 17:39:20 lamy systemd[1]: powertop.service: Consumed 3.266s CPU time.
我怎样才能知道它是否工作正常？