An update on the matter, I went through this awesome page [0] regarding debugging suspend/resume issues, and this particular instruction seems to have removed the unwanted resume problem in my case:
root@caolila:~# cat /proc/acpi/wakeup Device S-state Status Sysfs node ... XHC S3 *enabled pci:0000:00:14.0 ... root@caolila:~# echo XHC > /proc/acpi/wakeup root@caolila:~# cat /proc/acpi/wakeup Device S-state Status Sysfs node ... XHC S3 *disabled pci:0000:00:14.0 ... In other words, disabling USB 3.0 devices' capabilities of resuming the system keeps the laptop at sleep successfully. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1811236 Title: System wakes from suspend without user initialization To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1811236/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs