Public bug reported:

This started happening after I upgrade to ubuntu 18.04.2. In 18.04.1
hibernation was working flawlessly on my machine. (with kernel 4.15-46!
not a kernel issue then?)

Another thing that got updated recently was nvidia drivers which were
known to cause hibernation issues, but those were on restoring the
snapshot.  --> I get stuck on this screen after
running hibernate or pm-hibernate. (sys-req REISUB combination works
there and is the only good way to restart I found)


Laptop Dell Inspiron 7567 A30P
Intel Core i7-7700HQ
1x 16 GB DDR4 
1 TB HDD + 256 GB SSD 
Nvidia GeForce GTX 1050 
Ti FHD display 
Intel Dual Band Wireless AC 3165 
1x1 Motherboard: 
Intel HM175 Graphics adapter: 
NVIDIA GeForce GTX 1050 Ti (Laptop) - 4096 MB, 
Core: 1620 MHz, 
Memory: 1752 MHz, 
GDDR5, (ForceWare 373.20), 
Nvidia Optimus

nvidia driver: 415.27


# uname -a
Linux matheus-Inspiron-15-7000-Gaming 4.15.0-46-generic #49-Ubuntu SMP Wed Feb 
6 09:33:07 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

# free -m
              total        used        free      shared  buff/cache   available
Mem:          15906        2925        8742         161        4238       12485
Swap:         16333           0       16333

# cat /etc/fstab | grep swap
# swap was on /dev/sda8 during installation
UUID=70d967e6-ad52-4c21-baf0-01a813ccc6ac none            swap    sw            
  0       0

root@matheus-Inspiron-15-7000-Gaming:/home/matheus# cat /var/log/syslog | grep 
root@matheus-Inspiron-15-7000-Gaming:/home/matheus# cat /var/log/syslog | grep 
root@matheus-Inspiron-15-7000-Gaming:/home/matheus# cat /var/log/syslog | grep 
root@matheus-Inspiron-15-7000-Gaming:/home/matheus# cat /var/log/syslog | grep 

I could find nothing scrolling up on syslog about the hibernation process or 
with grep.... 

An interesting Note is that if I run hibernate just after I boot, it works and 
resumes perfectly! But after some system usage it randomly has that problem if 
I try. The percentage it freezes at is also random, sometimes 0, 1 even 30 once.

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: hibernation s2disk suspend-resume

** Attachment added: "syslog"

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  s2disk freezes at saving image to disk (hibernation)

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