Public bug reported:
I am running Kubuntu 25.04.
I have had increasingly severe boot problems in the last couple of
weeks. Everything seems to go fine, but instead of the login greeter, I
get a black screen, sometimes with text, but maybe a blank cursor, or
with a few very dull lines of terminal text, depending on the boot
parameters. The only way to proceed is to do Alt+PrScr then R, then
switch the TTY.
At present I think the kernel is to blame. At one point, I thought that
maybe secure boot or firmware updates were the cause, but that no longer
seems likely. For a while, booting in recovery mode or with the splash
screen disabled allowed boot to complete. Now it almost always fails.
Thankfully, I kept some old kernels. Using two versions back, I was able
to boot (still with splash disabled - haven't tried restoring that yet).
Here's the current info.
Ubuntu 6.14.0-28.28-generic 6.14.8
Some other hints. Occasionally I've ended up with the following as the
only information on screen:
Starting systemd-backlight:amdgpu-bl1.service - Load/Save Screen Backlight
Brightness of backlight:amdgpu_bl1...
Finished systemd-backlight:amdgpu-bl1.service - Load/Save Screen Backlight
Brightness of backlight:amdgpu_bl1.
I can confirm that the backlight on this laptop has been wonky in other
ways, randomly resetting to a low brightness on a regular basis.
I also tried changing grub to use "nomodeset". That seems to boot more
reliably, but then my external monitors connected to my docking station
no longer work.
ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: linux-image-6.14.0-28-generic 6.14.0-28.28
ProcVersionSignature: Ubuntu 6.14.0-28.28-generic 6.14.8
Uname: Linux 6.14.0-28-generic x86_64
ApportVersion: 2.32.0-0ubuntu5.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Sep 27 17:37:05 2025
InstallationDate: Installed on 2025-07-05 (84 days ago)
InstallationMedia: Kubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
MachineType: LENOVO 20XK00BNUS
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-28-generic
root=/dev/mapper/vg1-Kubuntu ro
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.14.0-28-generic N/A
linux-backports-modules-6.14.0-28-generic N/A
linux-firmware 20250317.git1d4c88ee-0ubuntu1.6
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/26/2025
dmi.bios.release: 1.32
dmi.bios.vendor: LENOVO
dmi.bios.version: R1MET62W (1.32 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20XK00BNUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76538 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.32
dmi.modalias:
dmi:bvnLENOVO:bvrR1MET62W(1.32):bd06/26/2025:br1.32:efr1.32:svnLENOVO:pn20XK00BNUS:pvrThinkPadT14Gen2a:rvnLENOVO:rn20XK00BNUS:rvrSDK0T76538WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XK_BU_Think_FM_ThinkPadT14Gen2a:
dmi.product.family: ThinkPad T14 Gen 2a
dmi.product.name: 20XK00BNUS
dmi.product.sku: LENOVO_MT_20XK_BU_Think_FM_ThinkPad T14 Gen 2a
dmi.product.version: ThinkPad T14 Gen 2a
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug plucky
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https://bugs.launchpad.net/bugs/2125854
Title:
Boot problems with T14 Gen 2
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