Thanks @kaihengfeng for the bisection instructions and @jail-j for
pointing me in the right direction. (It's probably worth mentioning that
sudo make -j`nproc` deb-pkg was needed for the build to work)

Here's the most recent 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

wasn't sure if I'm meant to keep going so I've run sudo make -j`nproc`
deb-pkg again to see what it comes up with.

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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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