The saga continues. Today I was able to boot with the newest kernel, which failed repeatedly before, albeit only in text mode.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2125854 Title: Boot problems with T14 Gen 2 Status in linux package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2125854/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
