Here's a more succinct update of how things seem to be progressing:
- There's a bugzilla.kernel.org bug report that describes this same
behaviour: https://bugzilla.kernel.org/show_bug.cgi?id=199025
- 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 <rafael.j.wyso...@intel.com>
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 <rafael.j.wyso...@intel.com>
Acked-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Reviewed-by: Ulf Hansson <ulf.hans...@linaro.org>
:040000 040000 b4ef369c698a10cec8d6224fdc3b8f287eb853b1
20327192ca09ecc0cf0b24b62fdb915ea303b988 M drivers
- from an email list I saw that @kaihengfeng has contacted a kernel.org
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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https://bugs.launchpad.net/bugs/1774950
Title:
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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