It's a race condition in sddm; I have no way how to accurately express which hardware is more affected. Any comments would be based upon sampling bias.
I will say the same thing happened in gdm and I made a gdm code change to fix it. Based on how the race condition works another option is to include the DRM modules in the initramfs. This should cause them to be finished loading by the time sddm starts (which is after initramfs is done). -- 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: Black screen with SDDM Status in SDDM: New Status in linux package in Ubuntu: Invalid Status in sddm 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/sddm/+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
