Completely disable systemd power-saving modules:

sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

Disable systemd lid switch (for laptops):

sed -i -e 's/HandleLidSwitch=suspend/HandleLidSwitch=ignore/' /etc/systemd/logind.conf

The above became necessary as systemd-logind was detecting that the lid was closed and calling suspend.target. The calls …

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