Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble third-party-packages
** Attachment added: "Omen kernel: Linux version 6.8.0-64-generic"
https://bugs.launchpad.net/bugs/2117520/+attachment/5892298/+files/kernel-6.8.0-64-black-screen-logs.tar.gz
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https://bugs.launchpad.net/bugs/2117520
Title:
Kernel panic/freeze on HP OMEN with kernel 6.8.0-64-generic
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