Can you try v4.13? There's a new commit introduced in v4.14:

commit ecc1165b8b743fd1503b9c799ae3a9933b89877b
Author: Rafael J. Wysocki <[email protected]>
Date:   Thu Aug 10 00:30:09 2017 +0200

    ACPICA: Dispatch active GPEs at init time
    
    In some cases GPEs are already active when they are enabled by
    acpi_ev_initialize_gpe_block() and whatever happens next may depend
    on the result of handling the events signaled by them, so the
    events should not be discarded (which is what happens currently) and
    they should be handled as soon as reasonably possible.
    
    For this reason, modify acpi_ev_initialize_gpe_block() to
    dispatch GPEs with the status flag set in-band right after
    enabling them.
    
    Signed-off-by: Rafael J. Wysocki <[email protected]>
    Tested-by: Mika Westerberg <[email protected]>

Let's see if this commit introduce the regression.

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https://bugs.launchpad.net/bugs/1799235

Title:
  kworker process starts at 85% of cpu and stays there

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