when viewing journalctl file you may come to know that the following things failed to run
i} ata1.01: failed to resume link (SControl 0)
It's a kernal warning not error for more details check the below links
- http://www.dell.com/support/manuals/in/en/inbsdt1/red-hat-entps-lx-v6.0/RHEL6IIGPub-v9/Red-Hat-Enterprise-Linux-65-displays-the-ata101-failed-to-resume-link-(Scontrol-0)-error-message?guid=GUID-943E9EC8-EBB5-4A58-84C3-FC7F4010D22E&lang=en-us
- http://permalink.gmane.org/gmane.linux.ide/49813
rc = 4 means that an instance of tlp is already running applying settings. E.g. tlp is "locked" and the new instance just terminates without doing anything. This is necessary because on most laptops a change of power source triggers multiple udev events (use tlp-stat --pev to watch them). TLP < 0.9 didn't block these duplicate invocations.
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