[Bug 1760106] Re: FFe: Enable configuring resume offset via sysfs

[Dimitri John Ledkov]

Please note, I'm not part of the release team.

Over the lifetime of bionic userspace it will be used on newer kernels,
or those that backport this particular feature.

Despite this being a "new" interface, I see this as actually a minor bug
and deficiency of Linux platform, given that other operating systems
support swapfile hybernation just fine. Thus it's merely a bug fix.
However, the value of knowing that "bionic GA and above" are fixed would
be really nice. As far as I can tell, the linux kernel patch is in
proposed already, and userspace should follow too. I'll look into
cherrypicking that into systemd.

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https://bugs.launchpad.net/bugs/1760106

Title:
  FFe: Enable configuring resume offset via sysfs

Status in klibc package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in systemd package in Ubuntu:
  New
Status in klibc source package in Bionic:
  New
Status in linux source package in Bionic:
  Fix Committed
Status in systemd source package in Bionic:
  New

Bug description:
  In 4.17 a new attribute is introduced to configure the hibernation
  resume offset. Since Ubuntu enables a swapfile by default this
  attribute is important to be able to make hibernation work "out of the
  box".

  The patch in the kernel is here:
  https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=355064675f1c997cea017ea64c8f2c216e5425d9

  Systemd support for adopting this change is available here:
  https://github.com/systemd/systemd/pull/8406
  As of 3/30/18 it's not yet been merged however.

  Klibc support for adopting this change is available here:
  https://www.zytor.com/pipermail/klibc/2018-March/003986.html

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