[Bug 2042710] Re: Can't enter cryptsetup password on MacBook Pro 2017 (MacBookPro14, 1) due to missing kernel modules in initramfs

[Benjamin Drung]

Terence, can you verify that intel_lpss_pci is needed and that
spi_pxa2xx_platform is not enough?

I found the relevant difference between Fedora and Ubuntu: Fedora builds
intel_lpss_pci into the kernel:

```
$ podman run -it fedora:latest /bin/bash
[root at a0c841a1d76f /]# dnf install kernel-core
[root at a0c841a1d76f /]# grep INTEL_LPSS_PCI /lib/modules/6.5.11-300.fc39.x86_64/config 
CONFIG_MFD_INTEL_LPSS_PCI=y
```

but Ubuntu builds it as module:

```
$ grep INTEL_LPSS_PCI /boot/config-6.5.0-10-generic 
CONFIG_MFD_INTEL_LPSS_PCI=m
```

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https://bugs.launchpad.net/bugs/2042710

Title:
  Can't enter cryptsetup password on MacBook Pro 2017 (MacBookPro14,1)
  due to missing kernel modules in initramfs

Status in initramfs-tools package in Ubuntu:
  Triaged
Status in initramfs-tools source package in Mantic:
  New

Bug description:
  I have a MacBook Pro 2017 (MacBookPro14,1) with an encrypted root
  partition, which I decrypt via passphrase during boot, at the "Please
  unlock disk nvme0n1p4_crypt" prompt.

  Using 23.04 "Lunar" this worked fine. However after upgrading to 23.10
  "Mantic", the built-in keyboard doesn't work for entering the
  passphrase.

  Quickest workaround: plug in a USB keyboard for entering the
  passphrase.

  Workaround: add the following modules to "/etc/initramfs-
  tools/modules":

  spi_pxa2xx_platform
  intel_lpss_pci

  ... then "sudo update-initramfs -u".

  I found that both kernel modules were required to get the keyboard
  recognised in initramfs.

  I did a bit of digging into what changed for 23.10. It could
  potentially (?) be commit 2df78bbb143884b9601a32608e12e43d40ccb0b0 "Do
  not install ARM/RISCV specific modules on other architectures".

  I had a look into how dracut handles it. Turns out that they
  specifically include "spi_pxa2xx_platform" after reporting a similar
  bug report in Fedora:
  https://bugzilla.redhat.com/show_bug.cgi?id=2166209

  I don't know how (if?) they handle the 2nd module, "intel_lpss_pci".

  Anyway, I don't need an immediate fix since the workaround works for
  me. Just posting this for further investigation, and for any other
  MacBook Pro users in the same situation. Thanks for working on Ubuntu,
  I think you're all amazing!

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