Bug ID: 202871
           Summary: Ubuntu 18.04 suspends intermittently
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.14.105
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Sleep-Wake
        Regression: No

Created attachment 281719
dmesg file output

I am using Lenovo Thinkpad E450 with Ubuntu 18.04.2 and kernel version is Linux

I am currently not able to suspend my laptop properly.
I first experienced this when I was using the kernel 4.15.46.

Expected behavior when commanded to suspend:
Display goes black, the CPU fan is switched off, the power LED pulsates showing
that the computer is in suspend mode. This should happen whenever the PC is
suspended using the command 'sudo systemctl suspend' or closing the lid or
choosing suspend in the menu options by long-pressing the power button.

What actually happens:
If any of the above methods is used to suspend the PC, the display goes black,
the PC goes to suspend state after a few seconds, but remains in suspend only
for a maximum of 7-10 seconds. After that it automatically resumes, with the
display trying to show the lockscreen if lid is not closed. If lid is closed,
then I know it has resumed as the power LED stays on and the fan runs. As time
goes, it intermittently goes to suspend for a few seconds and resumes back.
There is no unnatural behavior according to 'journalctl' or 'dmesg'. The system
supposedly goes to suspend "only for a few seconds" and resumes back.

To resolve this issue I tried using 4.18 kernel and still the issue
persisted.(Original kernel version was 4.15)
In another forum, I was suggested to use 4.14 kernel and even now the issue

I don't know if this information would be helpful but during boot, I got these
ACPI Error: Needed type [Reference], found [Integer] (____ptrval____)
ACPI Error: AE_AML_OPERAND_TYPE, While resolving operands for [Store]
ACPI Error: Method parse/execution failed \_PR.CPU0._PDC, AE_AML_OPERAND_TYPE

I also did a 'cat /sys/kernel/debug/suspend_stats' which returned 5 successes
and 0 failures of any type.

PS: I don't think this is a bug based on a particular application/package, so I
didn't include any.
Thanks in advance

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