[Bug 2097231] ProcEnviron.txt

[beMOTION]

apport information

** Attachment added: "ProcEnviron.txt"
   https://bugs.launchpad.net/bugs/2097231/+attachment/5854755/+files/ProcEnviron.txt

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Title:
  LUKS Passphrase: AltGr + Shift Triggers VT100 Pseudographic Mode

Status in cryptsetup package in Ubuntu:
  New
Status in initrd-tools package in Ubuntu:
  New
Status in plymouth package in Ubuntu:
  New

Bug description:
  Hello,

  I have encountered the following issue on Ubuntu 18, 20, and 22, and now again after upgrading to Ubuntu 24, using Ext4 with LUKS.
  Additionally, after performing a fresh install of Ubuntu 24 in October with encrypted ZFS (LUKS), the same issue has reappeared — this time more frequently and nearly “permanently.”

  Regardless of whether I use the laptop’s internal keyboard (HP ProBook 450 G6 or Lenovo Yoga X1 Gen8 — note that I cross-referenced the issue by transferring the SSD between both Laptops) or an external USB keyboard (directly connected or via docking station), the problem remains the same: the input switches to VT100 pseudographics as soon as I press AltGr+Shift, and sometimes I got the impression it happens on my German keyboard layout up on pressing AltGr+Q to produce the “@” symbol.
  This makes it impossible to enter my passphrase.

  On previous versions (e.g., Ubuntu 22 upgraded to 24), rebooting
  usually solved the problem 99% of the time. However, since October it
  takes me over 60 minutes and approximately 30 reboots before I was
  “lucky” enough to input the passphrase and boot the system.

  As a workaround, I created a second LUKS passphrase without the @
  symbol, but I would like to address and resolve the root of the issue.

  I have searched extensively but cannot find any information about this
  specific issue or whether it is expected behavior for initrd/LUKS
  Passhprase environment/Plymouth to allow VT100 mode switching.

  Here is what the issue looks like to me:
  https://ubuntucommunity.s3.us-east-2.amazonaws.com/original/3X/d/e/de7c362f350b7f38e08c9ed2c99b808f969a1289.jpeg

  As you can see, I can press every single key and get the expected
  character. However, as soon as I press AltGr+Q and created the @
  Symbol, it switches to VT100 pseudographics.

  As a user in ubuntu irc suggested, its most likely VT100: https://en.wikipedia.org/wiki/Shift_Out_and_Shift_In_characters
  Neither CTRL+C, ESC, nor SI/SO Key combinations like CTRL+N, CTRL+O, nor C0/C1 control codes like ^N, ^O, ^[, ^X (https://en.wikipedia.org/wiki/C0_and_C1_control_codes) restores regular character input.

  Another Keycombination that activates VT100 is some timing related
  AltGr + Shift. It does not happen when I press both keys longer, but I
  did manage to go in AND out of VT100 Mode by some quick/short
  combination of those.

  May I ask if there is a way to deactivate the VT100 pseudographics
  entirely for initrd, or if this feature could be implemented and be
  set to "off" by default as most users will never make use of this
  feature anyway?

  Thank you

  See previously Ubuntu Discourse post regarding this behaviour:
  https://discourse.ubuntu.com/t/plymouth-luks-passphrase-altgr-q-symbol-or-altgr-shift-triggers-vt100-pseudographic-mode/50746/1
  --- 
  ProblemType: Bug
  ApportVersion: 2.28.1-0ubuntu3.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 24.04
  InstallationDate: Installed on 2024-11-13 (81 days ago)
  InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827.1)
  NonfreeKernelModules: zfs
  Package: plymouth
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 6.11.0-1013.13-oem 6.11.0
  Tags: noble wayland-session
  Uname: Linux 6.11.0-1013-oem x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sudo users
  _MarkForUpload: True
  cmdline: BOOT_IMAGE=/BOOT/ubuntu_n3gtoe@/vmlinuz-6.11.0-1013-oem root=ZFS=rpool/ROOT/ubuntu_n3gtoe ro text
  crypttab: dm_crypt-0 PARTUUID=dbc7a221-c205-4222-a072-098993c914f7 /dev/urandom swap,initramfs,cipher=aes-xts-plain64:sha256,size=512,plain

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