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Accepted
cipricus
Asked: 2023-08-24 04:42:48 +0800 CST

Remember /sys/power/mem_sleep setting after reboot

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I had this solution for the question Macbook takes 20 seconds to wake up where I had to run echo s2idle | sudo tee -a /sys/power/mem_sleep in order to set /sys/power/mem_sleep to [s2idle] deep But after some update that change is not remembered after reboot, and that setting is reverted to s2idle [deep].

How can that be fixed so that the needed setting is remembered?

(Or even better - maybe someone has a better solution to the initial problem linked above.)

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kubuntu

1 Answers

  1. Best Answer

    This is a matter of running a script after reboot as root.

    sudo crontab -e

    Selecting nano, added a record to the bottom, containing the path to my script (mentioned in answer under link in question):

    @reboot path/to/script/to/be/run/as/root

    The script is:

    #!/bin/sh
echo s2idle | sudo tee -a /sys/power/mem_sleep

    We can see user's and root's crontab entries as follows:

    crontab -l       # list your user crontab entries
sudo crontab -l  # list root's crontab entries
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