I have the same issue on a Dell Latitude 5420 - and I can not use the workaround described in the question - writing to /sys/power/mem_sleep seems to be prohibited, even for a root user:
$ ls -als /sys/power/mem_sleep 0 -rw-r--r-- 1 root root 4096 Mar 3 17:16 /sys/power/mem_sleep $ sudo echo deep > /sys/power/mem_sleep bash: /sys/power/mem_sleep: Permission denied -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1860390 Title: Dell XPS 13 (9360) defaults to s2idle sleep/suspend instead of deep (suspend to ram) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1860390/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
