Interestingly, if I rebuild the initramfs with "MODULES=dep", I get the
following firmware files in the initramfs under usr/lib/firmware/intel:

usr/lib/firmware/intel/ibt-11-5.ddc.zst
usr/lib/firmware/intel/ibt-11-5.sfi.zst
usr/lib/firmware/intel/ibt-12-16.ddc.zst
usr/lib/firmware/intel/ibt-12-16.sfi.zst

And the following (currently loaded) btintel kernel module:

usr/lib/modules/6.8.0-11-generic/kernel/drivers/bluetooth/btintel.ko.zst

Note that my failure is for intel/ibt-19-0-4.sfi specifically though,
not listed above.

Building with "most", I get none of the above, these are the only files
in the "intel" directory:

usr/lib/firmware/intel/ice
usr/lib/firmware/intel/ice/ddp
usr/lib/firmware/intel/ice/ddp/ice-1.3.35.0.pkg.zst
usr/lib/firmware/intel/ice/ddp/ice.pkg.zst

There's also no match (via lsinitramfs) for "btintel" when I build using
"most".

However, bluetooth works fine using "most', and not with "dep", so I'm
likely barking up the wrong tree here.

Full diff between the two initramfs files here:

https://paste.ubuntu.com/p/vMR5BGf9Hy/

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https://bugs.launchpad.net/bugs/2056111

Title:
  Bluetooth driver disappears from initramfs  with MODULES=dep on 24.04

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