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Since I failed to find a way to tell systemctl to go to sleep in a one-time specified mode (see previous question), I decided to write some script to change whether the system goes to sleep in shallow or deep mode by writing directly into /sys/power/mem_sleep.

Available values on my system are s2idle and deep (default).

However, though I did that before, I cannot do it anymore: echo "[s2idle] deep" | sudo tee /sys/power/mem_sleep returns tee: /sys/power/mem_sleep: write error: Invalid argument and manual edit via vim as root I also cannot save. I think I set the default kernel sleep mode to be deep... could that be the problem?

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1 Answer 1

Reset to default
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I think if you cat /sys/power/mem_sleep, you'll see a list, with the one selected in brackets:

$ cat /sys/power/mem_sleep
s2idle [deep]

If you want to change the selection, write the name of the one you want, not the entire line:

$ echo s2idle | sudo tee /sys/power/mem_sleep
$ cat /sys/power/mem_sleep
[s2idle] deep

If your desired state does appear in this list, check your BIOS or UEFI setup for suspend-related settings.

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  • damn, that was simple, I should have thought of it from the behavior of /sys/power/state, thanks for your help!
    – Silmathoron
    Commented Oct 12, 2022 at 12:43
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    It's actually not that simple. Things like sudo echo "s2idle" > /sys/power/mem_sleep, or sudo echo "s2idle" >> /sys/power/mem_sleep, don't work due to permissions issues since apparently the echo command gets sudo applied, but not the writing part to the file. So, the sudo tee technique, oddly enough, is required.
    – Gabriel Staples
    Commented Jun 12, 2023 at 15:50
  • @AndyDalton, nobody suggested it here. But I was stuck on that and landed here after a google search. I suspect others land here from similar Google searches, so I just figured I'd point it out.
    – Gabriel Staples
    Commented Jun 13, 2023 at 16:51

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