Public bug reported:
Hi, I am experiencing a regression in the latest Ubuntu kernel package.
**Hardware & GPU details:**
- Laptop: Dell Precision M4800
- iGPU: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller
- dGPU: NVIDIA Corporation GK107GLM [Quadro K1100M] (rev a1)
- Driver in use: 'nouveau' (open-source kernel driver)
- OS: Kubuntu 26.04 (Wayland)
**Symptoms:**
When waking up the laptop from suspend, the screen remains pitch black (no
backlight turns on). The system is actually responsive in the background: when
I press my FIDO2 security key, it blinks, I can authenticate and the system
unlocks, but the display output/backlight remains completely dead.
**Regression confirmation:**
- Kernel 7.0.0-28-generic: BROKEN (reproducible every time on resume, black
screen)
- Kernel 7.0.0-27-generic: OK (works perfectly, screen wakes up immediately on
resume)
Since only the kernel version was changed and Mesa/KWin remained the same, this
is a clear kernel regression in the DRM/nouveau/i915 subsystem.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Jul 18 22:38:20 2026
InstallationDate: Installed on 2026-04-28 (81 days ago)
InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423)
IwDevWlp3s0Link: Not connected.
MachineType: Dell Inc. Precision M4800
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-28-generic
root=UUID=0865911a-d995-4fff-b0d8-34f3e26f1603 ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 10/08/2018
dmi.bios.release: 65.25
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A25
dmi.board.name: 0V5GVY
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA25:bd10/08/2018:br65.25:svnDellInc.:pnPrecisionM4800:pvr00:rvnDellInc.:rn0V5GVY:rvrA00:cvnDellInc.:ct9:cvr:sku05CC:pfa:
dmi.product.name: Precision M4800
dmi.product.sku: 05CC
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2161214
Title:
[Regression] Black screen / no backlight on resume from suspend in
kernel 7.0.0-28-generic (Dell Precision M4800, Optimus Intel + Quadro
K1100M on nouveau)
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