[Bug 1848771]

[yu.c.chen]

Ferry, Chris,
I thought you were trying to test hibernation. Let's switch back to
suspend to mem.
The first thing is to figure out what suspend mode you are using:
1. boot with the same kernel with TPM disabled.
2. cat /sys/power/mem_sleep,
    echo 'N' > /sys/module/printk/parameters/console_suspend
    echo 'Y' > /sys/module/printk/parameters/initcall_debug
and leverage pm_test mode to narrow down:

3. echo  different mode to /sys/power/pm_test
    start from right to left (freezer to devices to platform...)
   [none] core processors platform devices freezer
    check if the system could resume back within 5 seconds.

For example:
  echo freezer > /sys/power/pm_test
  echo mem > /sys/power/state

if succeed to resume back, then:
   save the dmesg and launch the next test mode:
  echo devices> /sys/power/pm_test
  echo mem > /sys/power/state

and go on util you see a hang during resume.

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https://bugs.launchpad.net/bugs/1848771

Title:
  Reboot after resume from suspend (deep)

Status in linux package in Ubuntu:
  Incomplete
Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  After upgrading to Kubuntu Eoan (19.10) yesterday, my laptop crashes
  after resume from suspending. This is regardless the way of suspending
  (closing lid, selecting suspend from sddm, systemctl suspend).

  The journal shows:
  ferry at chromium:~$ journalctl -b -1 -e
  ..
  sddm[1106]: Message received from greeter: Suspend
  NetworkManager[836]: <info>  manager: sleep: sleep requested (sleeping: no  enabled: yes)
  NetworkManager[836]: <info>  device (60:73:BC:BA:B8:68): state change: disconnected -> unmanaged (reason '
  NetworkManager[836]: <info>  device (60:73:BC:23:8F:3E): state change: disconnected -> unmanaged (reason '
  NetworkManager[836]: <info>  device (p2p-dev-wlp1s0): state change: disconnected -> unmanaged (reason 'sle
  NetworkManager[836]: <info>  manager: NetworkManager state is now ASLEEP
  systemd[1]: Reached target Sleep.
  systemd[1]: Starting Suspend...
  systemd-sleep[1238]: Suspending system...
  kernel: PM: suspend entry (deep)

  On resume (keypress, open lid) resume starts but immediately crashes
  and reboots.

  The laptop is an Acer 720p Chromebook with Chromium replaced and
  working fine with Kubuntu since 5 years or so.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Oct 18 18:45:53 2019
  InstallationDate: Installed on 2017-07-13 (826 days ago)
  InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago)
  VarLogDistupgradeTermlog:

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