Public bug reported:
On Ubuntu 26.04 with TPM-backed Full Disk Encryption (UKI-based, pc-kernel snap
architecture), the Plymouth splash screen displays correctly during boot but
does not appear during shutdown or restart. The screen instead shows plain
text/console output (or goes blank) during the shutdown sequence.
System configuration:
Ubuntu 26.04
pc-kernel snap: 7.0.0-27.27 (rev 3589, tracking 26.04/stable)
Full Disk Encryption: TPM2-based, no passphrase (auto-unlock)
Boot architecture: UKI (kernel.efi) + systemd-boot, not GRUB/initramfs-tools
GPU: dual-GPU system — Intel integrated GPU as primary/display output, AMD
discrete GPU present for compute/gaming with no display connected to it
Steps to reproduce:
Install Ubuntu 26.04 with TPM-backed FDE enabled on a dual-GPU (Intel + AMD)
system
Boot the system — Plymouth splash displays correctly
Reboot or shut down the system
Observe: no Plymouth splash appears during shutdown/reboot
Expected behavior: Plymouth splash should display consistently on both boot and
shutdown/reboot.
Actual behavior: Splash only appears on boot; shutdown/reboot shows text
console output instead.
Diagnostics already collected:
journalctl -b -1 -u plymouth-poweroff.service -u plymouth-reboot.service:
jul 12 20:06:36 mope-ubuntu systemd[1]: Starting plymouth-reboot.service - Show
Plymouth Reboot Screen...
jul 12 20:06:37 mope-ubuntu systemd[1]: Started plymouth-reboot.service - Show
Plymouth Reboot Screen.
The service starts and completes with no errors logged, suggesting systemd's
handoff to Plymouth succeeds, but the visual splash does not render — pointing
toward a DRM/display handoff issue during the shutdown phase rather than a
service configuration problem.
Suspected related issue: This may share a root cause with LP #2105377
("Plymouth doesn't always show splash screen if DRM drivers get pulled into
initrd unexpectedly"), given the dual-GPU configuration. Possibly the AMD GPU
(with no display attached) is interfering with the DRM/KMS handoff during the
shutdown teardown path specifically, while the Intel GPU cleanly claims the
display during boot.
Additional notes: This is a cosmetic issue only — the system otherwise
functions correctly, including TPM unlock and shutdown itself completing
normally.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: plymouth 24.004.60+git20250831.4a3c171d-0ubuntu8
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 13 18:12:51 2026
DefaultPlymouth: /usr/share/plymouth/themes/bgrt/bgrt.plymouth
MachineType: Dell Inc. OptiPlex SFF Plus 7010
ProcCmdLine: snapd_recovery_mode=run console=ttyS0,115200n8 console=tty1
panic=-1 quiet splash snapd.xkb="br,pc105,,"
ProcEnviron:
LANG=pt_BR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: snapd_recovery_mode=run console=ttyS0,115200n8 console=tty1
panic=-1 quiet splash snapd.xkb="br,pc105,,"
SourcePackage: plymouth
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/24/2026
dmi.bios.release: 1.36
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.36.0
dmi.board.name: 00V166
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.ec.firmware.release: 1.22
dmi.modalias:
dmi:bvnDellInc.:bvr1.36.0:bd04/24/2026:br1.36:efr1.22:svnDellInc.:pnOptiPlexSFFPlus7010:pvr:rvnDellInc.:rn00V166:rvrA01:cvnDellInc.:ct3:cvr:sku0BD0:pfaOptiPlex:
dmi.product.family: OptiPlex
dmi.product.name: OptiPlex SFF Plus 7010
dmi.product.sku: 0BD0
dmi.sys.vendor: Dell Inc.
** Affects: plymouth (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2160567
Title:
Plymouth splash does not appear on shutdown/reboot (works correctly on
boot) — TPM-backed FDE, dual GPU (Intel + AMD)
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