** Tags added: kernel-daily-bug -- 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/2117520
Title: Kernel panic/freeze on HP OMEN with kernel 6.8.0-64-generic Status in linux package in Ubuntu: New Bug description: Bug Report: Kernel 6.8.0-64 Black Screen Issue with NVIDIA 550.144.03 on Dual-GPU HP OMEN 1. Title Black screen on boot with kernel 6.8.0-64, NVIDIA 550.144.03 driver, dual-GPU HP OMEN system 2. Problem Summary [Provide high-level description of the issue - system fails to display graphics after kernel upgrade, black screen condition persists, system appears to boot but no visual output] 3. System Information [Paste key hardware/software data here] - Hardware: HP OMEN [model] - CPU: [processor info] - GPU1 (Intel): [integrated graphics info] - GPU2 (NVIDIA): [discrete graphics info] - RAM: [memory details] - OS: [distribution and version] - Kernel versions tested: 6.8.0-63 (working), 6.8.0-64 (broken) - NVIDIA driver: 550.144.03 - Display manager: [GDM/SDDM/LightDM etc.] - Desktop environment: [GNOME/KDE/etc.] 4. Kernel ComparisonAspect Kernel 6.8.0-63 (Working) Kernel 6.8.0-64 (Broken)Boot behavior Normal graphics display Black screen after bootNVIDIA driver loading [status] [status]VGA arbitration [behavior] [behavior]fbcon status [status] [status]Display output Functional No output 5. Reproduction Steps Boot system with kernel 6.8.0-64 [Add specific boot parameters if any] Wait for boot sequence to complete Observe black screen condition [Additional steps to reproduce the issue] 6. Expected vs Actual Behaviour Expected Behaviour: - System boots normally with graphical display - NVIDIA driver loads successfully - Desktoenvironment starts properly - Display output functions correctly Actual Behaviour: - Black screen after kernel loading - No graphical output visible - System appears to boot (based on [indicators]) - [Other observed symptoms] 7. Log Analysis Summary Key Console Messages Demonstrating the Issue: Working (6.8.0-63) - Full Console Transition: [ 0.679846] fbcon: Deferring console take-over [ 4.256791] fbconDeferring console take-over # i915 driver loads [ 43.673979] fbcon: Taking over console # ✓ WORKING: Console properly taken over [ 43.674000] Console: switching to colour frame buffer device 240x67 Broken (6.8.0-64) - Console Stuck in Deferred State: ``` Jul 22 11:34:22 Omen kernel: fbcon: Deferring consoletake-over Jul 22 11:34:24 Omen kernel: fbcon: i915drmfb (fb0) is primary device Jul 22 11:34:24 Omen kernel: fbcon: Deferring console take-over # i915 loads successfully ✗ BROKEN: “fbcon: Taking over console” NEVER occurs **VGA Arbitration Messages (Identical in both kernels):** Early boot VGA setup: [ 0.587475] pci 0000:00:02.0: vgaarb: setting as boot VGA device [ 0.587475] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none [ 0.587475] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none [ 0.587475] vgaarb: loaded i915 driver initialization (WORKING in both kernels):[ 4.162107] i915 0000:00:02.0: vgaarb: deactivate vga console [ 4.164400] i915 0000:00:02.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=none:owns=io+mem [ 4.256787] fbcon: i915drmfb (fb0) is primary device [ 4.256791] fbcon: Deferring console take-over ``` 8. Technical Analysis Root Cause Identified: The kernel 6.8.0-64 has a regression in the framebuffer console (fbcon) subsystem that prevents the console from transitioning from the early simpledrm driver to the full Intel i915 graphics driver. VGA Arbitration Working: Both kernels show identical and correct VGA arbitration behavior i915 Driver Loading: The Intel graphics driver initializes successfully in both kernels fbcon Regression: In 6.8.0-64, the fbcon: Taking over console event never occurs Console State: System gets stuck with deferred console, never switching to the full graphics mode Display Result: Black screen as the console never properly transitions to the graphical framebuffer Kernel Subsystems Affected: fbcon (framebuffer console): Primary regression point DRM/KMS (Direct Rendering Manager): Console transition mechanism affected i915 graphics driver: Driver loads correctly but console handover fails Timing Analysis: 6.8.0-63: Console takeover occurs ~43 seconds after boot 6.8.0-64: Console takeover never occurs, system remains in deferred state Full logs referenced: - Working: working-boot-6.8.0-63/dmesg_6.8.0-63.txt (~43 second successful takeover) - Broken: logs/kmsg_prevboot.txt, logs/journal_prevboot.txt (takeover never occurs) 9. Workarounds Confirmed Working Solutions: Boot with kernel 6.8.0-63 - Temporary solution Add kernel parameter nomodeset - Disables kernel mode setting Add kernel parameter nvidia-drm.modeset=0 - Disables NVIDIA DRM modesetting Boot parameter i915.modeset=0 - Disables Intel graphics modesetting (if applicable) Additional Parameters to Try: nouveau.modeset=0 (if nouveau is loading) vga=normal acpi_backlight=vendor 10. Impact Frequency: [How often the issue occurs - 100% reproducible, intermittent, etc.] Severity: High - affects system bootability and daily usability User Impact: Blocks normal desktop use, requires kernel downgrade or boot parameters Scope: [Affects specific hardware combinations - dual-GPU systems, HP OMEN series, etc.] Business Impact: [If applicable - productivity loss, development workflow interruption] Additional Notes: [Space for any additional observations, community reports, or supplementary information] Testing Environment: [Details about testing methodology, reproduction attempts, hardware variations tested ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-image-6.8.0-63-generic 6.8.0-63.66 ProcVersionSignature: Ubuntu 6.8.0-63.66-generic 6.8.12 Uname: Linux 6.8.0-63-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.28.1-0ubuntu3.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: krillavilla 5991 F.... wireplumber /dev/snd/controlC0: krillavilla 5991 F.... wireplumber /dev/snd/seq: krillavilla 5987 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Tue Jul 22 12:20:22 2025 InstallationDate: Installed on 2024-07-02 (385 days ago) InstallationMedia: Kubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240425.1) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 05c8:03ab Cheng Uei Precision Industry Co., Ltd (Foxlink) HP Wide Vision HD Camera Bus 001 Device 003: ID 8087:0029 Intel Corp. AX200 Bluetooth Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: HP OMEN by HP Laptop ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-63-generic root=UUID=1726672d-766b-4b36-8ba2-190f8ffaa3d9 ro net.ifnames=0 biosdevname=0 ipv6.disable=1 quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-6.8.0-63-generic N/A linux-backports-modules-6.8.0-63-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.14 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/07/2021 dmi.bios.release: 15.16 dmi.bios.vendor: AMI dmi.bios.version: F.16 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 8466 dmi.board.vendor: HP dmi.board.version: 68.22 dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.ec.firmware.release: 68.22 dmi.modalias: dmi:bvnAMI:bvrF.16:bd07/07/2021:br15.16:efr68.22:svnHP:pnOMENbyHPLaptop:pvr:rvnHP:rn8466:rvr68.22:cvnHP:ct10:cvrChassisVersion:sku4CC49UA#ABA: dmi.product.family: 103C_5335KV HP OMEN dmi.product.name: OMEN by HP Laptop dmi.product.sku: 4CC49UA#ABA dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2117520/+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
