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

Update – stability confirmation on 6.13.12

After extended real-world testing, I can now confirm:

Kernel 6.13.12-061312-generic is fully stable on my system.
Multiple consecutive suspend/resume cycles (10+) succeed without HDMI signal loss.

Environment:

Zorin OS 18 Core (Ubuntu 24.10-based)

Wayland session

Radeon R9 380 (Tonga XT, amdgpu)

Ryzen 5 5500

B450 Aorus Pro WIFI (BIOS F66)

HDMI 1080p60 direct connection

Behavior summary:

• 6.12.x → fully stable
• 6.13.12 → fully stable in extended testing
• 6.14+ → resume instability begins
• 6.17.0-14 → reproducible HDMI black screen after 1–2 suspend cycles

This narrows the regression window between 6.13 and 6.14.

Symptoms in broken kernels:

System resumes (fans/LEDs active)

Monitor reports no signal / out of range

dmesg shows EDID-related errors on HDMI-A-1 during resume

Requires hard reboot to restore display

Given that 6.13.12 is stable and 6.14+ is not, this may be related to
display reinitialization, EDID re-probing, or DC changes introduced
after 6.13.

I'm willing to:

Test 6.14.x point releases

Collect comparative dmesg logs (6.13 vs 6.17)

Help narrow down specific commits if needed

My goal is to return to the latest stable kernel once the regression is
resolved.

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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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