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[Thibault Ferrante <2126559@xxxxxxxxxxxxxxxxxx>]

** Changed in: initramfs-tools (Ubuntu Noble)
       Status: In Progress => New

** Changed in: initramfs-tools (Ubuntu Noble)
       Status: New => Confirmed

** Changed in: initramfs-tools (Ubuntu Plucky)
       Status: In Progress => Confirmed

** Changed in: initramfs-tools (Ubuntu Noble)
     Assignee: Thibault Ferrante (thibf) => (unassigned)

** Changed in: initramfs-tools (Ubuntu Plucky)
     Assignee: Thibault Ferrante (thibf) => (unassigned)

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https://bugs.launchpad.net/bugs/2126559

Title:
  Missing usb/host/xhci-pci-renesas kernel module in the initramfs

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Noble:
  Confirmed
Status in initramfs-tools source package in Plucky:
  Confirmed
Status in initramfs-tools source package in Questing:
  Fix Released

Bug description:
  [ Impact ]

   * Unable to boot from usb for specific intel hardware (GNR)
   * Especially an issue for ubuntu ISO.

  [ Fix ]

   * As done for questing, whitelist the missing module to be included in the initramfs.
   * This is a similar fix that what was done by dracut [1].

  [ Test Plan ]

   * Build an initramfs with initramfs-tools updated and check that
  drivers/usb/host/xhci-pci-renesas.ko.zst has been included

  [ Where problems could occur ]

   * Increase slightly size of the initramfs.

  [ Other info ]

   * Checked for other missing usb drivers in dracut code, nothing is
  coming up.

  1: https://github.com/dracut-ng/dracut-ng/commit/20cc20d2ac9c2908da6735b04dba49c1cb1b0bab
  __________
  On specific intel hardware (GNR), the Ubuntu ISO 24.04.3 doesn't boot when selecting the hwe kernel.
  After looking at the initrd generated, the hwe-initrd is missing kernel/drivers/usb/host/xhci-pci-renesas.ko.zst:

  $ lsinitramfs casper/initrd | grep kernel/drivers/usb/host/
  usr/lib/modules/6.8.0-71-generic/kernel/drivers/usb/host/xhci-pci-renesas.ko.zst
  usr/lib/modules/6.8.0-71-generic/kernel/drivers/usb/host/xhci-pci.ko.zst
  usr/lib/modules/6.8.0-71-generic/kernel/drivers/usb/host/xhci-plat-hcd.ko.zst
  $ lsinitramfs casper/hwe-initrd | grep kernel/drivers/usb/host/
  usr/lib/modules/6.14.0-27-generic/kernel/drivers/usb/host/xhci-plat-hcd.ko.zst

  xhci-pci module is also not there as it's in 6.14 a builtin.

  As depmod is used to find dependencies across modules, I guess it is
  missing dependencies for builtins.

  In 6.8.0 we can find in the associated modules.dep:
  kernel/drivers/usb/host/xhci-pci.ko.zst: kernel/drivers/usb/host/xhci-pci-renesas.ko.zst
  But it's not the case in 6.14.0.

  Related bug:
  - https://bugs.launchpad.net/cisco-ucs-server/+bug/2121594
  - https://bugs.launchpad.net/ubuntu/+bug/2124218

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