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

Danilo Machado Thu, 19 Mar 2026 07:11:03 -0700

## 🐞 Bug Description

Regression affecting AMD Radeon R9 380 (Tonga): HDMI output stops
working after suspend/resume when using X11.


The system continues running normally after resume, but the display
loses signal completely ("no signal"). A reboot is required to restore
video output.

---

## 🔍 Hardware

* GPU: AMD Radeon R9 380 (Tonga)
* CPU: AMD Ryzen 5 5500
* RAM: 16 GB
* Display: HDMI

---

## 🖥️ Software

* Kernel:

  * Linux 6.3 → ✅ Working
  * Linux 6.4+ → ❌ Regression present
* Driver: amdgpu (RADV Tonga)

---

## ⚠️ Affected Environment

* X11 → ❌ HDMI “no signal” after resume
* Wayland → ✅ Works normally

This strongly suggests an issue specific to the X11/DRM interaction
path.

---

## 🧪 Bisect Result

A full `git bisect` was performed:

* Good: 457391b0380335d5e9a5babdec90ac53928b23b4 (Linux 6.3)
* Bad: 6995e2de6891c724bfeb2db33d7b87775f913ad1 (Linux 6.4)

Result:

First bad commit:
b3c98052d46948a8d65d2778c7f306ff38366aac
Merge tag 'kvm-x86-vmx-6.4'

Last known good:
4a5fd419952e49ef870e9259d815718062871cc1

Full bisect log available upon request.

---

## 🔁 Steps to Reproduce

1. Boot system with HDMI connected
2. Log into an X11 session
3. Suspend the system
4. Resume
5. HDMI signal is lost ("no signal")

---

## 🧠 Additional Notes

* All intermediate commits tested were marked as GOOD.
* Regression appears to be introduced indirectly via a merge.
* Likely related to display reinitialization or EDID handling after resume.

---

## 💡 Additional Context

This GPU, although older, is still actively used and capable of running
modern workloads and games (e.g., via Proton).

Maintaining stability for this class of hardware remains important,
especially considering current GPU market costs.

---

## 🙏 Final Notes

I can provide logs and perform additional tests 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

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

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