[Bug 2098105] Re: Enable the HWE kernel flavor for 24.04.3

[Dan Bungert]

lowlatency fix is probably:

commit ac326c4327bd381d083636d1539f51fa1ab114a4
Author: Dan Bungert <daniel.bungert at canonical.com>
Date:   Wed Feb 12 18:40:26 2025 -0700

    build: fix FLAVOUR set for lowlatency

diff --git a/live-build/auto/build b/live-build/auto/build
index ddcb7bc3..222a5b52 100755
--- a/live-build/auto/build
+++ b/live-build/auto/build
@@ -510,6 +510,9 @@ for FLAVOUR in $LB_LINUX_FLAVOURS; do
 		intel-iotg*)
 			FLAVOUR="intel-iotg"
 			;;
+		lowlatency-hwe-*)
+			FLAVOUR="lowlatency"
+			;;
 	esac
 	KVERS="$( (cd "binary/$INITFS"; ls vmlinu?-* 2>/dev/null || true) | (fgrep -v .efi || true) | sed -n "s/^vmlinu.-\\([^-]*-[^-]*-$FLAVOUR\\)$/\\1/p" )"
 	if [ -z "$KVERS" ]; then

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https://bugs.launchpad.net/bugs/2098105

Title:
  Enable the HWE kernel flavor for 24.04.3

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Noble:
  Fix Committed

Bug description:
  [ Impact ]

  As part of 24.04.2, we should have enabled the HWE kernel for desktop and server.
  Desktop switches to HWE by default, but server images need to offer both.
  Additionally, desktop flavors make that switch too at the same time.

  Unfortunately, this was overlooked for .2, but will be necessary for
  24.04.3. The goal is to land that as soon as Noble .2 is out, so that
  people really needing the HWE stack will be able to grab a daily.

  
  [ Test Case ]

  Wait for daily builds once the HWE kernel is available.
  * Double check that the images build correctly.
  * Boot the desktop image and confirm it's using the HWE kernel.
  * Boot the server image and confirm there's a selection of which kernel to use and both GA and HWE kernels work.
  * Check flavor desktop images and make sure those also use the HWE kernel.

  
  [ Where problems could occur ]

  Any regressions would possibly be around kernel selection for our
  images. Maybe checking flavors if they are still using the right ones
  would make sense. Most issues would be visible with image build
  failures.

  
  [ Other Info ]

  6.11 HWE stack has already landed in noble-updates, so it's very
  straightforward to confirm which kernel is in use (vs 6.8, GA kernel)

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