A somewhat detailed summary of the issue, generated by Claude based on my debugging session:
Title: Kernel 7.0.0-28-generic breaks display resume after suspend on Intel Kaby Lake (i915, device ID 5917) — screen stays black, system otherwise functional Summary: After upgrading from kernel 6.17.0-40-generic to 7.0.0-28-generic (via apt upgrade/apt full-upgrade on 2026-07-17), the laptop's internal display panel fails to re-light after resuming from suspend (deep sleep). The system itself resumes correctly — keyboard (Caps Lock LED), Bluetooth, Wi-Fi, and the full Plasma desktop session all become responsive, and SSH access confirms the OS is fully functional. Only the eDP panel output stays black. Hardware: GPU: Intel HD Graphics 620 (Kaby Lake, device ID 5917), driver i915 Display: internal eDP-1 panel, 1920x1080 Desktop: KDE Plasma (X11 session), Kubuntu 24.04 LTS (HWE kernel) Steps to reproduce: Boot into kernel 7.0.0-28-generic Close the laptop lid (or otherwise trigger suspend; PM: suspend entry (deep) confirmed in journal) Reopen the lid to resume Screen remains completely black. Keyboard LEDs and other hardware respond normally. System is reachable via SSH and fully operational underneath. Expected behavior: Display should resume normally, as it does on kernel 6.17.0-40-generic (confirmed working). Additional information: Journal shows clean suspend/resume cycle with no kernel errors (PM: suspend entry (deep) → PM: suspend exit, no gap, no crash). i915, kwin_x11, kscreen, and plasmashell all initialize/reconfigure without error after resume. Issue confirmed to NOT occur when booting the previous kernel, 6.17.0-40-generic, with identical hardware/session — narrowing this to a regression introduced between 6.17.0-40 and 7.0.0-28. Workaround: pin/boot 6.17.0-40-generic via GRUB. Kernel versions involved: Broken: linux-image-7.0.0-28-generic (7.0.0-28.28~24.04.1) Working: linux-image-6.17.0-40-generic (6.17.0-40.40~24.04.1) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161299 Title: screen does not show anything after wake To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-7.0/+bug/2161299/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
