Unable to suspend and hibernate laptop

I’we done some reading about this and probably you have to create the following file:

/etc/systemd/system/sleep.conf

[Sleep] 
HibernateMode=shutdown

This file tells Systemd to write shutdown instead of platform to /sys/power/disk before writing disk to /sys/power/state .
Taken from here:
https://wiki.archlinux.org/index.php/Laptop/HP

Have you tried this?

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