I have had this problem in the past and it reemerged on an upgrade from
16.04 to 18.04 and have resolved it. For me (Lenovo Yoga) the issue is
with USB rewaking the machine.
The following fix worked for me.
1) Created file: /etc/systemd/system/toggle.XHC.to.fix.suspend.issue.service
with following informaiton
[Unit]
Description="Make suspend ignore USB wake up."
[Service]
ExecStart=/bin/bash -c "echo XHC >> /proc/acpi/wakeup"
[Install]
WantedBy=multi-user.target
2) Created a symbolic link to above script in /etc/systemd/system/multi-
user.target.wants
3) Executed following commands
sudo systemctl daemon-reload
sudo systemctl start toggle.XHC.to.fix.suspend.issue.service
4) checked service was started with
sudo systemctl status toggle.XHC.to.fix.suspend.issue.service
5) Enable it on boot with
sudo systemctl enable toggle.XHC.to.fix.suspend.issue.service
Last steps are based on
https://www.reddit.com/r/archlinux/comments/3zxg65/how_to_permanently_change_procacpiwakeup_or/
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https://bugs.launchpad.net/bugs/1574120
Title:
Notebook doesn't suspend when lid is closed after update to 16.04
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