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suspend
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URL:
https://askubuntu.com/q/822337
Title:
Ubuntu fails to "Suspend"
ID:
/2016/09/08/Ubuntu-fails-to-_Suspend_
Created:
September 8, 2016
Edited: February 8, 2020
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September 15, 2024
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In your BIOS setup there can be a setting to Wake on LAN or Wake on USB. If these are on turn them off and see if that fixes the problem.
I’ve also found that a bad USB cable connected to a powered-hub can generate error messages in dmesg but I’m not sure if that would wake up the system.
Update February 8, 2020
These lines in your log file:
Running hook /usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend:
Failed to connect to non-global ctrl_ifname: (null) error: No such file or directory
/usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend: success.
Are perhaps the reason /lib/systemd/system-sleep/wpasupplicant was created as described in this discussion. Check if this file exists and if not see this: