Source: linux Version: 6.12.113-1 Severity: normal Tags: upstream X-Debbugs-Cc: [email protected], [email protected] User: [email protected] Usertags: amd64
Dear Maintainers, On my ThinkPad L14 Gen 2 AMD (20X6S0K400), resuming from suspend-to-idle consistently leaves the built-in display black for approximately 10 seconds before the lock screen appears. Locking without suspending does not cause this delay. System: - Debian 13, kernel package version 6.12.113-1 - Running kernel: 6.12.113+deb13-amd64 - BIOS: R1KET46W (1.31), dated 2024-04-02 - NVMe: WDC PC SN730 SDBQNTY-512G-1001, firmware 11170101 - Suspend mode: s2idle Without additional kernel parameters, kernel timestamps show approximately 10 seconds between “ACPI: EC: interrupt unblocked” and the start of AMD graphics resume. Booting the same kernel with iommu=pt eliminates the visible delay. I expected resume to restore the display promptly without requiring IOMMU passthrough. A potentially relevant observation is that the AMD PMC firmware workaround table includes L14 Gen 2 AMD machine type 20X5, but not my 20X6. This omission is also present in current upstream source. Could maintainers assess whether the existing workaround should cover 20X6? I have not tested a patched or upstream-built kernel. A similar report for another omitted sibling model, X13 Gen 2 AMD 20XJ, is Ubuntu bug #2168884: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2168884 -- System Information: Debian Release: 13.7 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.12.113+deb13-amd64 (SMP w/16 CPU threads; PREEMPT) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
