Ubuntu 18.04 - Dell XPS15 9570 - Impossible to reliably suspend/hibernate

Sadly I decided to upgrade to 18.04. Now I pass half of my work hours fixing bugs.

Today specialty is: suspend the laptop. Last time I tried to suspend my XPS15 9570 I almost burned up my new 2000$ because it was running for 3 hours in my backpack instead of being suspended.

As well documented in a lot of threads, out of the box 18.04 on a lot of laptop is unable to suspend the laptop. There are official bug reports 3 years old, no solution or fix whatsoever. It will simply wake up after 5 seconds or when you close the lid (very sneaky, very dangerous).

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1574120 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1786094

I tried everything, the only solution that works for me is the one reported here:

Ubuntu 18.04 - Dell XPS13 9370 no longer suspends on lid close

that is changing the grub config to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=deep"

With this change the system actually suspend properly, but when it wakes up wi-fi/bluetooth adapter are completely dead, not even a reboot is able to bring them back.

Something similar is reported here

https://bugzilla.kernel.org/show_bug.cgi?id=201469

and maybe here https://bugzilla.redhat.com/show_bug.cgi?id=1514836

I also tried to hibernate, without any success (the system will simply shut down). This is probably my fault since I'm missing a swap partition.

After passing the whole day reading and trying solution I decide to open this thread. My question is simple: how can I, end user in 2019, suspend my laptop without shutting down wifi or other key components of my HW?

I know that I sound arrogant but I lost one day of work on a standard feature that should not pose any problem.

Thank you for any assistance, I hop you had a better day than mine.

Edit /etc/default/grub with

sudo vim /etc/default/grub

make sure that the GRUB_CMDLINE_LINUX line has the following items:

GRUB_CMDLINE_LINUX="nouveau.blacklist=1 acpi_osi=! acpi_osi=\"Windows 2015\" acpi_backlight=vendor mem_sleep_default=deep"

or

GRUB_CMDLINE_LINUX="nouveau.blacklist=1 mem_sleep_default=deep"

Insert acpi_osi=! acpi_osi=\"Windows 2015\ will not change screen brightness.

update grub:

sudo update-grub

reboot after computer has restarted, try suspending to see if the laptop wakes up normally

First answer option 2

GRUB_CMDLINE_LINUX="nouveau.blacklist=1 mem_sleep_default=deep"

did it for me. XPS 15 9570 Ubuntu 18.04

I did not need to edit that /lib/systemd/system-sleep script.