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[legolas558 <1412077@xxxxxxxxxxxxxxxxxx>]

I think I have found the root cause of this bug:
/lib/modules/3.13.0-44-generic/modules.dep (and its .bin counterpart)
are wrong and don't include the -extra modules.

You can easily verify diff with a diff from -43-generic modules.dep

In attachment the modprobe failure (ran on a -43 kernel) that documents
this problem.

** Attachment added: "theproblem.log"
   https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1412077/+attachment/4301147/+files/theproblem.log

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https://bugs.launchpad.net/bugs/1412077

Title:
  [PATCH] HID USB keyboards not working in initramfs

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  This bug might either be in the kernel extra package or initramfs-
  tools, can't decide.

  I have tested all following version of the kernel:

  - linux-image-3.13.0-35-generic
  - linux-image-3.13.0-36-generic
  - linux-image-3.13.0-37-generic
  - linux-image-3.13.0-39-generic
  - linux-image-3.13.0-40-generic
  - linux-image-3.13.0-41-generic
  - linux-image-3.13.0-43-generic
  - linux-image-3.13.0-44-generic *

  In all of them except latest (-44), if the corresponding -extra
  package is not installed then USBs keyboard will not work (and display
  mode will also not be set correctly, although it's a separate issue).

  I have narrowed down the issue to the fact that hid, hid-generic and
  usbhid modules are missing and thus not loaded.

  Possibly related bugs:

  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1238194
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1066376
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/229732
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/886149
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1054292
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1017991

  ==== Update 18 January

  Sorry if you received too many notifications, I have tried my best
  document the issue and find a solution.

  This issue can be split in 3 separate issues now:

  1) functions in initramfs-tools' hook-functions do not handle command
  failures (please merge attached patch), also for modprobe which made
  it very difficult to troubleshoot the other issues

  2) hid modules are currently in extra but - considering the past
  amount of bug reports and spoilt user experience - these ought better
  be in the -generic package*

  3) linux-image-3.13.0-44-generic doesn't sport a modules.dep that
  covers the -extra package (as it did in the past)

  I hope this bug report will be useful to you guys.

  * = if this is not advisable for the -generic package, then would be
  nice that update-initramfs failed or displayed a warning about USB
  keyboard usage when -extra is not installed, instead of silently
  including all those goodies when it is, as it does now

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