Public bug reported:
I am using Kubuntu on a Dell Latitude 7280 with Intel HD Graphics 620.
Without any kernel workaround, the internal display does not turn back
on after either DPMS display power-off or system suspend.
Symptoms:
* The screen remains completely black.
* Ctrl+Alt+F2/F3/F4 does not switch to a virtual console.
* The system appears unresponsive.
* The only way to recover is to hold the power button and force a shutdown.
Hardware and software:
* Computer: Dell Latitude 7280
* BIOS: 1.41.3
* GPU: Intel Corporation Kaby Lake-U GT2 [HD Graphics 620]
* Graphics driver: i915
* Main tested kernel: 7.0.0-22-generic
* Also reproduced with: 6.17.0-35-generic
* Desktop: KDE Plasma
* Reproduced under both Wayland and X11
Steps to reproduce with display power management:
1. Boot normally without i915.enable_dc=0.
2. Run:
xset dpms force off
3. Try to wake the display using the keyboard or mouse.
Actual result:
The internal display remains black and the system has to be forcibly
powered off.
Steps to reproduce with suspend:
1. Boot normally without i915.enable_dc=0.
2. Run:
sudo systemctl suspend
3. Press the power button to resume.
Actual result:
The system does not resume correctly. The screen remains black and the
machine appears frozen.
Tests already performed:
* Tested both suspend modes: deep and s2idle.
* Tested i915.enable_psr=0: no improvement.
* Tested kernels 7.0.0-22-generic and 6.17.0-35-generic: the issue occurred
with both.
* BIOS is already updated to version 1.41.3.
* Reproduced with both KDE Plasma Wayland and Plasma X11.
A previous boot log contained:
i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A
The following kernel parameter fixes both problems:
i915.enable_dc=0
After adding it to the kernel command line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0"
the internal display powers off and wakes correctly, and suspend/resume
also works correctly.
The current value is confirmed with:
cat /sys/module/i915/parameters/enable_dc
which returns:
0
This suggests that Intel Display C-States are involved in the failure.
Please let me know if further i915 debugging information or additional
kernel logs are required.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-22-generic 7.0.0-22.22
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: antonio 1699 F.... pipewire
antonio 1703 F.... wireplumber
/dev/snd/pcmC0D0p: antonio 1699 F...m pipewire
/dev/snd/seq: antonio 1699 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Jun 21 17:29:49 2026
InstallationDate: Installed on 2025-12-16 (187 days ago)
InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0bda:568c Realtek Semiconductor Corp. Integrated Webcam
HD
Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: Dell Inc. Latitude 7280
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-22-generic
root=UUID=42d7b726-4f01-417b-99a5-9d693e647797 ro quiet splash i915.enable_dc=0
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: 02/09/2025
dmi.bios.release: 1.41
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.41.3
dmi.board.name: 0KK5D1
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.41.3:bd02/09/2025:br1.41:svnDellInc.:pnLatitude7280:pvr:rvnDellInc.:rn0KK5D1:rvrA00:cvnDellInc.:ct10:cvr:sku079F:pfaLatitude:
dmi.product.family: Latitude
dmi.product.name: Latitude 7280
dmi.product.sku: 079F
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2157741
Title:
[Dell Latitude 7280][Intel HD 620] Black screen and system freeze
after display power-off or suspend; fixed by i915.enable_dc=0
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2157741/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
