Additional observation from further testing. System:
GPU: AMD Radeon R9 380 (Tonga) CPU: Ryzen 5 5500 Motherboard: Gigabyte B450 AORUS PRO WIFI Connection: HDMI Kernel: 6.8.0-101-generic Distribution: Zorin OS 18 (Ubuntu-based) I tested suspend/resume behavior using both Wayland and X11 sessions. Wayland: Suspend and resume work reliably. The monitor wakes normally and HDMI output is restored correctly. X11: Short suspend cycles work normally. However, after a longer suspend period (approximately 10–15 minutes or more), the system resumes but the monitor receives no signal and remains black. The system itself appears to resume correctly, suggesting that the issue is specifically related to display reinitialization over HDMI. This behavior may indicate differences in how Wayland and X11 handle GPU display state restoration after deeper suspend states. I hope this observation helps further isolate the issue. -- 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
