[Bug 2157741] [NEW] [Dell Latitude 7280][Intel HD 620] Black screen and system freeze after display power-off or suspend; fixed by i915.enable_dc=0

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 subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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 Status in linux package in Ubuntu: New Bug description: 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. 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