Public bug reported: ThinkPad X1 Carbon 5th gen (Intel Kaby Lake iGPU, device ID 5916, i915 driver), Ubuntu 26.04, GNOME Shell 50.1 on Wayland. After suspend (mem_sleep = deep/S3), the system fails to wake: screen remains black, but the system is otherwise alive — keyboard backlight and fan resume, Caps Lock LED responds correctly to keypresses. VT switching (Ctrl+Alt+F3 → F1) does not restore display output. journalctl shows a clean suspend/resume cycle with no errors: PM: suspend entry (deep) ... ACPI: PM: Low-level resume complete PM: suspend exit No i915/DRM errors appear in logs around resume. Steps to reproduce: Suspend the system (lid close or systemctl suspend) Attempt to resume Expected: Display returns after resume Actual: Screen stays black; hard power-off required Regression testing: Kernel 7.0.0-28-generic: fails to resume, every time Kernel 7.0.0-27-generic: resumes correctly, every time (confirmed via GRUB advanced boot, multiple suspend/resume cycles) This strongly suggests a regression introduced between -27 and -28 affecting i915/display resume on this platform, not a hardware, ACPI, or compositor issue. Also tried, no effect: i915.enable_dc=0 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-28-generic 7.0.0-28.28 ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6 Uname: Linux 7.0.0-27-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mallick 2446 F.... wireplumber /dev/snd/seq: mallick 2442 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Sun Jul 19 08:34:05 2026 HibernationDevice: RESUME=UUID=45c7e173-c4f1-4da8-a583-246c71246f4a Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0a2b Intel Corp. Bluetooth wireless interface Bus 001 Device 003: ID 13d3:5682 IMC Networks SunplusIT Integrated Camera Bus 001 Device 005: ID 138a:0097 Validity Sensors, Inc. Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: LENOVO 20HRCTO1WW ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic root=UUID=5008e1f7-16e4-4c95-9559-0993912a6970 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: Upgraded to resolute on 2026-05-25 (55 days ago) dmi.bios.date: 07/22/2024 dmi.bios.release: 1.63 dmi.bios.vendor: LENOVO dmi.bios.version: N1MET78W (1.63 ) dmi.board.asset.tag: Not Available dmi.board.name: 20HRCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnLENOVO:bvrN1MET78W(1.63):bd07/22/2024:br1.63:efr1.22:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20HR_BU_Think_FM_ThinkPadX1Carbon5th:pfaThinkPadX1Carbon5th: dmi.product.family: ThinkPad X1 Carbon 5th dmi.product.name: 20HRCTO1WW dmi.product.sku: LENOVO_MT_20HR_BU_Think_FM_ThinkPad X1 Carbon 5th dmi.product.version: ThinkPad X1 Carbon 5th dmi.sys.vendor: LENOVO ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2161243 Title: System fails to resume from suspend (black screen) on kernel 7.0.0-28-generic; works correctly on 7.0.0-27-generic Status in linux package in Ubuntu: New Bug description: ThinkPad X1 Carbon 5th gen (Intel Kaby Lake iGPU, device ID 5916, i915 driver), Ubuntu 26.04, GNOME Shell 50.1 on Wayland. After suspend (mem_sleep = deep/S3), the system fails to wake: screen remains black, but the system is otherwise alive — keyboard backlight and fan resume, Caps Lock LED responds correctly to keypresses. VT switching (Ctrl+Alt+F3 → F1) does not restore display output. journalctl shows a clean suspend/resume cycle with no errors: PM: suspend entry (deep) ... ACPI: PM: Low-level resume complete PM: suspend exit No i915/DRM errors appear in logs around resume. Steps to reproduce: Suspend the system (lid close or systemctl suspend) Attempt to resume Expected: Display returns after resume Actual: Screen stays black; hard power-off required Regression testing: Kernel 7.0.0-28-generic: fails to resume, every time Kernel 7.0.0-27-generic: resumes correctly, every time (confirmed via GRUB advanced boot, multiple suspend/resume cycles) This strongly suggests a regression introduced between -27 and -28 affecting i915/display resume on this platform, not a hardware, ACPI, or compositor issue. Also tried, no effect: i915.enable_dc=0 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-28-generic 7.0.0-28.28 ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6 Uname: Linux 7.0.0-27-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mallick 2446 F.... wireplumber /dev/snd/seq: mallick 2442 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Sun Jul 19 08:34:05 2026 HibernationDevice: RESUME=UUID=45c7e173-c4f1-4da8-a583-246c71246f4a Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0a2b Intel Corp. Bluetooth wireless interface Bus 001 Device 003: ID 13d3:5682 IMC Networks SunplusIT Integrated Camera Bus 001 Device 005: ID 138a:0097 Validity Sensors, Inc. Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: LENOVO 20HRCTO1WW ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic root=UUID=5008e1f7-16e4-4c95-9559-0993912a6970 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: Upgraded to resolute on 2026-05-25 (55 days ago) dmi.bios.date: 07/22/2024 dmi.bios.release: 1.63 dmi.bios.vendor: LENOVO dmi.bios.version: N1MET78W (1.63 ) dmi.board.asset.tag: Not Available dmi.board.name: 20HRCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnLENOVO:bvrN1MET78W(1.63):bd07/22/2024:br1.63:efr1.22:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20HR_BU_Think_FM_ThinkPadX1Carbon5th:pfaThinkPadX1Carbon5th: dmi.product.family: ThinkPad X1 Carbon 5th dmi.product.name: 20HRCTO1WW dmi.product.sku: LENOVO_MT_20HR_BU_Think_FM_ThinkPad X1 Carbon 5th dmi.product.version: ThinkPad X1 Carbon 5th dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161243/+subscriptions
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