Hello Daniel, I created two bootable USB-sticks with exactly the images you said. With both I could successfully boot. But the same applies for Linux Mint with LiveCD. I seems that the console handover from Plymouth is handled differently when not installed on SSD/HDD.
Shall I install Ubuntu/Mint on the harddrive to test this hypthesis? On 06.07.2026 05:55, Daniel van Vugt wrote: > Thanks for the bug report. Could you try booting regular Ubuntu from > USB > and tell us if it has the same bug? > > 24.04: https://releases.ubuntu.com/24.04.4/ubuntu-24.04.4-desktop- > amd64.iso > > 26.04: https://releases.ubuntu.com/26.04/ubuntu-26.04-desktop-amd64.iso > > ** Changed in: plymouth (Ubuntu) > Status: New => Incomplete > > -- > You received this bug notification because you are subscribed to the > bug > report. > https://bugs.launchpad.net/bugs/2159603 > > Title: > Black screen during boot only when Plymouth splash is enabled > > Status in plymouth package in Ubuntu: > Incomplete > > Bug description: > Title: Black screen during boot only when Plymouth splash is enabled > > Distribution: Linux Mint 22.3, upgraded from Linux Mint 21.3 via 22.0 > Base: Ubuntu 24.04 / Noble > Affected package suspected: plymouth > GPU: AMD Barts XT / Radeon HD 68xx, using kernel radeon driver > Display server: X11 > Kernel(s) tested: 6.8.0-134-generic, 6.17 HWE; issue reproduced on > installed system > > Summary: > > The installed system boots successfully, but the display becomes > permanently black when the kernel command line contains `splash`, > which starts Plymouth. The system is not frozen: I can switch to > TTY3, > log in blindly, and reboot blindly. Removing only `splash` from the > kernel command line makes the system boot visibly and reliably. > > Reproduction matrix: > > * `quiet splash` → black screen > * `quiet` → boots visibly > * no `quiet`, no `splash` → boots visibly > * `quiet splash radeon.dpm=0` → black screen > * `radeon.dpm=0` without `splash` → boots visibly > > Expected behavior: > > With `quiet splash`, Plymouth should show the boot splash or cleanly > hand off to console/display manager. The screen should not remain > black while the OS continues running. > > Actual behavior: > > With `quiet splash`, the display goes black during boot and stays > black. The machine still reaches a login-capable state. Blind TTY > login works and `sudo reboot` works. > > Why I suspect Plymouth: > > The deciding variable is `splash`, not `radeon.dpm=0`. Adding > `radeon.dpm=0` does not help if `splash` remains present. Removing > `splash` fixes the issue. This suggests a Plymouth / DRM-KMS / > framebuffer handoff issue rather than a general kernel boot failure, > filesystem issue, package issue, or desktop-session failure. > > Workaround: > > Remove `splash` from `/etc/default/grub`, then run `sudo > update-grub`. > > Attachments included: > > * system-info.txt > * working-kernel.log > * working-kernel-full.log > * failed-kernel.log > * failed-kernel-full.log > * plymouth-debug-failed.log > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/2159603/+subscriptions -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2159603 Title: Black screen during boot only when Plymouth splash is enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/2159603/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
