[Bug 2065051] Update Released

[Brian Murray]

The verification of the Stable Release Update for ubuntu-release-
upgrader has completed successfully and the package is now being
released to -updates.  Subsequently, the Ubuntu Stable Release Updates
Team is being unsubscribed and will not receive messages about this bug
report.  In the event that you encounter a regression using the package
from -updates please report a new bug using ubuntu-bug and tag the bug
report regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/2065051

Title:
  [SRU] Migrate Pi users to KMS

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Noble:
  Fix Released

Bug description:
  [ Impact ]

  In switching Pi Server users over to the KMS overlay (as resolution to
  LP: #2038924) we need an additional quirk for upgraders to migrate
  config.txt (this will be similar, but not identical, to the one for
  LP: #1923673).

  If we do not migrate such users, the immediate impact is that Pi 5
  users will have no sound output on server images (the Pi 5 only has
  HDMI audio output, no auxiliary jack). Potentially more problematic in
  the long-run, though, is that we will wind up with users on different
  graphical stacks (the KMS stack, which is the only upstream supported
  stack going forward, and the legacy framebuffer method).

  [ Test Case ]

  * Flash Ubuntu jammy to SD card and boot on Pi 4
  * Check /boot/firmware/config.txt does not contain dtoverlay=vc4-kms-v3d (it should not on Pi server images)
  * sudo do-release-upgrade
  * Proceed through upgrade and reboot
  * Ensure system reboots successfully
  * After reboot, check /boot/firmware/config.txt contains dtoverlay=vc4-kms-v3d
  * Shutdown, move SD card to Pi 5 and boot it
  * Check /proc/asound/cards contains entries for vc4hdmi

  [ Regression Potential ]

  The use of the KMS overlay itself is not concerning; we already use it
  on the Pi desktop images, and have for several cycles now with no
  serious issues, so the regression potential there is minimal.

  However, the quirk does manipulate the bootloader's config.txt on the
  boot partition, which always carries the potential of leaving a system
  unbootable. To guard against this, tests are included with the quirk
  which check for several scenarios including a config.txt which has
  already been migrated to the KMS overlay manually by the user (there
  are various reasons to do this, including running kmscon), as well as
  the typical expected case.

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