[Bug 1938259] Re: Add ACCEL_LOCATION=base property for Dell clamshell models

[Dan Streetman]

With any SRU, it's important not to break existing users, so we can't
rely on users upgrading the kernel along with systemd; it needs to
continue to work without breaking if they upgrade systemd, but choose
not to upgrade the kernel.

In focal since it's only adding new entries, there should be no
breakage, and in impish since it's not released yet we don't need to
worry about any 'existing' users, but in hirsute it does appear we need
to keep the current entries, and just add the new sku-based entries as
well, unless there's a specific reason that the existing entry lines
should be removed in hirsute (i.e. if the existing lines actually
*cause* a problem, instead of simply not covering all hardware).

I pushed your commits to f/h/i, can you check to make sure they look ok?

https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/systemd/commit/?id=d02cab1a9aad017b68ca1117bf3f0bbcb1b9315c

https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/systemd/commit/?id=a21edd743408b5603b0177e9c230c6d6b919e589

https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/systemd/commit/?id=5c1be33900edee94da0dc9a4ade8edcd079b4c85

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https://bugs.launchpad.net/bugs/1938259

Title:
  Add ACCEL_LOCATION=base property for Dell clamshell models

Status in OEM Priority Project:
  New
Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Focal:
  In Progress
Status in systemd source package in Hirsute:
  In Progress
Status in systemd source package in Impish:
  In Progress

Bug description:
  We are planning to do SRU to systemd in focal, to avoid unwanted
  screen rotations on some Dell laptop models.

  [Impact]

   * This fixes unwanted rotations on certain Dell clamshell laptop
  models with accelerometer.

  [Test Plan]

   * On Dell laptops with model SKU 0A3E or 0E0E, install this package and kernel 5.13, or kernel with this patch backported:
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e26f023e01ef26b4138bc1099af309bdc4523d23
   * Rotate the laptop and the display should not be rotated.

  [Where problems could occur]

   * This is to add parameters for certain models in hwdb, and does not
  affect any other part of systemd.

   * This fix would only take effect with kernel 5.13 or the above patch
  backported.

  [scope]

  this is needed for all releases

  this is being fixed upstream by
  https://github.com/systemd/systemd/pull/20314

  [Other info]

   * The patch mentioned above is going to have a separated SRU for
  linux-oem-5.10 and linux-hwe-5.11 (LP: #1938143)

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