[Bug 206575] New: [amdgpu] [drm] No video signal on resume from suspend, R9 380

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206575

            Bug ID: 206575
           Summary: [amdgpu] [drm] No video signal on resume from suspend,
                    R9 380
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: veox+kernel at veox.pw
        Regression: No

Created attachment 287441
  --> https://bugzilla.kernel.org/attachment.cgi?id=287441&action=edit
dmesg output for resume-from-suspend, linux 5.5.4

OS: Arch Linux
GPU: (MSI) Radeon R9 380

On `systemctl suspend` and subsequent resume, the monitors display "no signal".
The machine is responsive, commands can be typed on the keyboard, SSH'ing is
also possible.

Somewhat unexpectedly, resume from hibernation works fine (i.e. there is
signal).

This started happening a few weeks ago, seemingly when `linux` v5.5.2 was
installed. Was also present on v5.5.3 and v5.5.4 (current).

`linux-lts` v5.4.20 does not exhibit this behaviour; it's a regression.

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