After additional testing I was able to precisely identify the regression window affecting suspend/resume on this system.
Hardware: AMD Radeon R9 380 (Tonga) Driver: amdgpu Environment: Zorin OS 18 (Ubuntu 24.04 base) Testing methodology: For each kernel version I performed the following steps: 1. Boot system 2. Confirm kernel version using `uname -r` 3. Suspend the system 4. Resume and verify if the display and keyboard respond normally Kernel testing results: 6.0 – suspend/resume works normally in X11 6.1 – works 6.2 – works 6.3 – works 6.4 – broken 6.7 – broken 6.9 – broken 6.10 – broken 6.11 – broken 6.12 – broken 6.13 – broken 6.14 – broken Conclusion: Last known good kernel: 6.3 First bad kernel: 6.4 Observed behavior: When resuming from suspend in X11 the display does not return and the keyboard becomes unresponsive. The system appears to hang until a forced reboot. Additional observation: The system resumes normally under Wayland on all tested kernels. Relevant log message during resume: amdgpu: PCI CONFIG reset [drm:detect_link_and_local_sink [amdgpu]] *ERROR* No EDID read. This message appears immediately after the GPU reset during the resume sequence. The regression window (6.3 → 6.4) seems to coincide with changes in the AMDGPU display code responsible for display initialization after GPU reset. This may indicate an issue related to display link detection or EDID probing during the resume process. This information may help narrow down the problematic commit. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2142389 Title: amdgpu (R9 380) fails to resume from suspend (deep sleep) – black screen, requires hard reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142389/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
