[Bug 2142389] Re: amdgpu (R9 380) fails to resume from suspend (deep sleep) – black screen, requires hard reboot

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.

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https://bugs.launchpad.net/bugs/2142389

Title:
amdgpu (R9 380) fails to resume from suspend (deep sleep) – black
screen, requires hard reboot

Status in linux package in Ubuntu:
New

Bug description:
AMDGPU suspend → display black / no video after resume on Radeon R9
380 (No EDID read)

Summary:
After system suspend from Zorin OS 18 (Ubuntu 24.10 base, kernel 6.17.0-14), the system sometimes resumes but the display remains black (no signal). System continues running (fans/LEDs active), but monitor shows no output. Only hard reboot restores video.

Steps to reproduce:

Boot Zorin OS 18 (Ubuntu 24.10 kernel 6.17).

Suspend system (e.g., via GNOME "Suspend").

Wait short period.

Attempt to resume (mouse/keyboard).

System wakes but display either shows garbled video or no output.

Observed behavior:

System appears not crashed (fans/LEDs/keyboard continue).

Screen stays black or displays remnants but no usable video.

Sometimes resume works, sometimes fails.

Relevant log excerpt:

amdgpu 0000:01:00.0: [drm] *ERROR* No EDID read.

Hardware:

Motherboard: Gigabyte B450 AORUS PRO WIFI

CPU: AMD Ryzen 5 5500

GPU: AMD Radeon R9 380 Series (Tonga, amdgpu driver)

Software environment:

Zorin OS 18 Core (Ubuntu 24.10 base)

kernel: 6.17.0-14-generic

X11 session

Workaround currently applied:
Suspend disabled. System remains stable without suspend.

Note: Bug appears related to video resume rather than system freeze;
display subsystem (EDID handshake) may fail after suspend.

Additional info:
Similar reports of amdgpu black screen / suspend issues exist (e.g., Launchpad #2141216) and community discussions on black screen resume after suspend for AMD GPUs.

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