* [Bug 221838] New: [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)
@ 2026-08-05 21:20 bugzilla-daemon
2026-08-06 9:14 ` [Bug 221838] " bugzilla-daemon
2026-08-06 15:28 ` bugzilla-daemon
0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2026-08-05 21:20 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=221838
Bug ID: 221838
Summary: [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)
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: high
Priority: P3
Component: Video(DRI - non Intel)
Assignee: drivers_video-dri@kernel-bugs.osdl.org
Reporter: ekonom1@atlas.sk
Regression: No
Created attachment 310579
--> https://bugzilla.kernel.org/attachment.cgi?id=310579&action=edit
Full system diagnostics including current dmesg, acpidump, lspci, lsusb, and
kernel logs
More info about bug on link
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161214
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.
***************
INTRODUCTION AND FOCUS OF THE BUG REPORT (BUG REPORT, LINUX KERNEL, KUBUNTU)
First, a quick note for the AI to ensure this transcription is correct: this is
a bug report regarding the Linux kernel on Kubuntu. Now, I will proceed to the
report itself.
Dear developers, I would be very grateful if you could fix this bug. I realize
that my computer is very, very old. That is one thing, but on the other hand,
Linux distributions are generally designed to support older hardware as well.
Therefore, I hope you will be willing to resolve this issue.
NON-STANDARD SYSTEM SETTINGS AND SECURITY (FSCRYPT, SYSTEMD-HOMED, FINGERPRINT)
It is true that I have a slightly non-standard setup on Kubuntu. I have an
encrypted home directory using fscrypt, and I also use systemd-homed with
fingerprint authentication to unlock the computer and the login screen. It is
actually fortunate that I use this option—these fingerprints—because it made it
much easier to identify the bug and pinpoint where the error stems from. I can
assure you with absolute certainty, indeed with 100% confidence, that this is
related to the Linux kernel, specifically something in the graphics department,
most likely the graphics drivers.
BUG BEHAVIOR AND SYMPTOMS (BRIGHTNESS REGULATION, BLACK SCREEN, SLEEP MODE,
FIDO2)
It is important to supplement this bug report with additional information:
whenever the very latest version of the Linux kernel is installed, it is
accompanied by other symptoms. Specifically, I am unable to regulate the screen
brightness; it is permanently stuck, I believe, at the absolute lowest
brightness level. Furthermore, as soon as I suspend the computer and wake it
back up, the screen is 100% black, as if the computer were completely turned
off and fails to turn on at all. We can reliably identify this as a
graphics-related issue because, by looking at the flashing of the FIDO2
security key, it is possible to deduce and conclude that I have successfully
logged in. There are LEDs on it that clearly signal when a successful login has
occurred. Thus, everything was working completely fine, except for the single
fact that the screen remained black the entire time.
THANKS TO THE DEVELOPERS AND CONCLUSION (BUG FIX, SUPPORT, THANKS)
So, dear developers, I wish you success in fixing this. May it cost you as
little work as possible, bring a great benefit, and may you manage to fix it as
quickly as possible with minimal effort. That is my wish for you. I wish you
the best of luck and thank you, developers, for your hard work.
Additionally, as a piece of supplementary information, I personally believe
that slightly non-standard configurations, such as home directory encryption
via systemd-homed, should not play a large or significant role in this issue.
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