Here's a more succinct update of how things seem to be progressing:

- There's a bug report that describes this same

- A kernel bisection between v4.14 and v4.15 gives this result:
git bisect bad
a192aa923b66a435aae56983c4912ee150bc9b32 is the first bad commit
commit a192aa923b66a435aae56983c4912ee150bc9b32
Author: Rafael J. Wysocki <>
Date: Mon Oct 16 03:29:55 2017 +0200

    ACPI / LPSS: Consolidate runtime PM and system sleep handling

    Move the LPSS-specific code from acpi_lpss_runtime_suspend()
    and acpi_lpss_runtime_resume() into separate functions,
    acpi_lpss_suspend() and acpi_lpss_resume(), respectively, and
    make acpi_lpss_suspend_late() and acpi_lpss_resume_early() use
    them too in order to unify the runtime PM and system sleep
    handling in the LPSS driver.

    Signed-off-by: Rafael J. Wysocki <>
    Acked-by: Greg Kroah-Hartman <>
    Reviewed-by: Ulf Hansson <>

:040000 040000 b4ef369c698a10cec8d6224fdc3b8f287eb853b1
20327192ca09ecc0cf0b24b62fdb915ea303b988 M drivers

- from an email list I saw that @kaihengfeng has contacted a
developer who has written a patch to test.

- I don't know if I'm supposed to test this patch (i might just be added
to the email list because I opened this bug report) or whether Kai-Heng
Feng will post here to let others try a kernel with the patch applied
and see if it works.

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  Suspend fails in Ubuntu and Kubuntu 18.04 but works fine in Ubuntu and
  Kubuntu 17.10 (and on Kubuntu 18.04 using kernel 4.14.47)

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