Hardware: Lenovo ThinkPad X1 Carbon 5th gen (system-product-name: 20HRCTO1WW) Intel Kaby Lake-U GT2 [HD Graphics 620], PCI ID [8086:5916] (rev 02) Intel Wireless-AC 8265
Bisect result: 7.0.0-27.27 (resolute-security): resumes from suspend correctly, every time, tested across multiple suspend/resume cycles 7.0.0-28.28 (resolute-updates): fails to resume every time — screen stays black, system otherwise alive (keyboard backlight/fan resume, Caps Lock LED responds to keypresses), no recovery via VT switch (Ctrl+Alt+F3 → F1) Suspend/resume logs (7.0.0-28.28, failing case): journalctl shows a clean cycle with no errors around resume: PM: suspend entry (deep) ... ACPI: PM: Low-level resume complete PM: suspend exit No i915/DRM errors logged. mem_sleep is set to deep (S3, not s2idle). Already ruled out: i915.enable_dc=0 kernel param — no effect on the failure Additional context: 7.0.0-28.28 has at least one other confirmed regression (amdgpu/ROCm performance, unrelated to this i915 issue), acknowledged by the Ubuntu Kernel Team on 2026-07-16 and shipped anyway to carry urgent security fixes: https://discourse.ubuntu.com/t/amdgpu-performance-regression-in-kernel-7-0-0-28-28/85237. Flagging in case this build warrants broader regression review. Happy to test any diagnostic kernel params or provide further logs — currently running 7.0.0-27.27 as a workaround (held via apt-mark). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161243/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
