[Bug 2069039] [NEW] Disk password prompt isn't shown in external monitor

[Sergio Costas]

Public bug reported:

Up to Ubuntu 23.10, when my laptop (which has encrypted hard disk)
booted, it asked for the deciphering password as usual, and, if an
external monitor was connected, the prompt was shown in both the
internal and the external screens. After updating to Ubuntu 24.04 this
no longer is the case: the prompt is shown only in the internal screen,
and the external one remains in powersave mode. After typing the
password, the system begins to boot and, after some seconds (I presume
that it's until the initramfs is pivoted), the external monitor wakes up
and shows the remaining boot process.

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2069039

Title:
  Disk password prompt isn't shown in external monitor

Status in plymouth package in Ubuntu:
  New

Bug description:
  Up to Ubuntu 23.10, when my laptop (which has encrypted hard disk)
  booted, it asked for the deciphering password as usual, and, if an
  external monitor was connected, the prompt was shown in both the
  internal and the external screens. After updating to Ubuntu 24.04 this
  no longer is the case: the prompt is shown only in the internal
  screen, and the external one remains in powersave mode. After typing
  the password, the system begins to boot and, after some seconds (I
  presume that it's until the initramfs is pivoted), the external
  monitor wakes up and shows the remaining boot process.

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