Well.

I tested 2 or 3 times and with 5.5 it was a super fast resume from suspension.
After a later test the same problem came. (I'm again updating the dmesg - This 
dmesg was generated after connecting to power once again, when I connect to the 
power plug everything resumes fine).


I also had to switch from the nvidia graphics to the intel because the dkms 
didn't work for 5.5.
 I will also test the 5.0 with the intel card, just to absolutely rule out 
nvidia problems.

To note again, only have these problems when resuming with battery
unplugged.

** Attachment added: "dmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861595/+attachment/5326412/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1861595

Title:
  Laptop does not resume after suspend. OK plugged-in, fails with
  battery

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This replicated in 18.10, 19.04 and 19.10.

  If I suspend the laptop by turning the lid of, or by

  #echo mem > /sys/power/state

  The nvme disk I have:
  # nvme list
  Node             SN                   Model                                   
 Namespace Usage                      Format           FW Rev
  ---------------- -------------------- 
---------------------------------------- --------- -------------------------- 
---------------- --------
  /dev/nvme0n1     03F107951E4452173098 Sabrent                                 
 1           1.02  TB /   1.02  TB    512   B +  0 B   ECFM12.2

  Make it to fail the resume process.

  Everything works fine while plugged in.
  If power by battery it fails to resume (attached dmesg file). It gets stuck 
into the desktop but it's dysfunctional without disk operation.

  If I suspend in battery mode and then resume (that fails to resume
  properly) and then plug in the power supply the disk resumes perfectly
  and everything comes back to normal.

  It doesn't always replicate, but I would say 80% of the time.

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