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Script on suspen and resume

Posted: Mon Apr 02, 2018 10:52 am
by Baikan4ik
good evening. I'm trying to write a script that runs when suspend system and resume system. I need the LCDd to terminate at suspend, and starts when resume system. Tell me how to implement this? At the moment I'm putting the script in the /etc/pm/sleep.d folder, another script is taken for the template, where I change the case code to the code I need, but it does not work ...

Re: Script on suspen and resume

Posted: Mon Apr 02, 2018 5:31 pm
by rene
Cannot check anything currently but hooking into systemd is likely the correct course of action on Mint 18.x. I.e., as per ... leep_hooks. See if that helps any.

Re: Script on suspen and resume

Posted: Mon Apr 02, 2018 9:15 pm
by rene
Back at a useful machine. Assuming that "LCDd" is the one from the standard lcdproc package you can as what I would consider the likely best approach create the following /etc/systemd/system/LCDd-sleep.service:

Code: Select all

Description=Restart LCDd over sleep

ExecStart=/bin/systemctl stop LCDd.service
ExecStop=/bin/systemctl start LCDd.service

and enable it via sudo systemctl enable LCDd-sleep.service. This unit makes itself part of systemd's which gets invoked on suspend and stops LCDd.service. On resume is stopped and it conversely starts LCDd.service again. Seems to work well here; cannot test the actual LCDd service but some logging seems to imply that the above should be all you need.

However: It is also the case that systemd in fact provides for suspend/resume hooks and some might consider that better; see man systemd-sleep for the information that you can also just dump a script in the /lib/systemd/system-sleep/ directory. There does not seem to be an /etc counterpart to that directory and that alone means I'd myself prefer the above method.

A note for anyone who'd like to: it seems not a good idea to adjust LCDd.service itself, mostly due to a seemingly missing "" and the resulting asymmetry between suspend and resume actions...

Re: Script on suspen and resume

Posted: Tue Apr 03, 2018 1:02 am
by Baikan4ik
Thank you very much) in the evening I will try and write about the results)