Determine wakeup cause (ACPI) I had a problem with my laptop to enter suspend mode, when I ran systemctl suspend it would just wake up immediately.&#xA;Let's find out what causes this.&#xA;Advanced Configuration and Power Interface (ACPI) First a few words about ACPI.&#xA;The embedded Linux systems I used to work with usually do not support ACPI, even if support for ACPI starts to show up on some…