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

### 🔄 Update – Additional trigger identified (DPMS)

After further testing, I identified a second trigger for the issue, not
limited to suspend/resume.

#### Reproduction (new scenario):

1. Resume system normally (works)
2. Let system go idle until screen turns off (DPMS)
3. Wake system via keyboard/mouse

#### Result:

* Display does not recover properly
* Black screen or corrupted session
* Behavior similar to suspend/resume failure

#### Key observation:

Disabling the phantom output (DVI-D-1) immediately restores the display.

#### Workarounds:

* `xrandr --output DVI-D-1 --off`
* Forcing HDMI-A-0 as primary
* Disabling automatic screen-off avoids the issue

#### Interpretation:

This suggests the issue affects **display reinitialization after power
transitions**, not just suspend.

Likely areas involved:

* EDID re-read
* HDMI link training
* atomic modeset restore
* DC state restore

This reinforces that the regression is likely timing/order related
rather than tied to a specific subsystem change.

More logs can be provided if needed.

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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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