[Bug 211981] New: AMDGPU: without cable attached videocard shuts down and does wake up again, log prints "[drm] Cannot find any crtc or sizes"

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211981

            Bug ID: 211981
           Summary: AMDGPU: without cable attached videocard shuts down
                    and does wake up again, log prints "[drm] Cannot find
                    any crtc or sizes"
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.10.10
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: raulvior.bcn at gmail.com
        Regression: No

Created attachment 295505
  --> https://bugzilla.kernel.org/attachment.cgi?id=295505&action=edit
Dmesg when no output is attached. Framebuffer not initalized.

Linux boot shows the message in the title of this bug report if the videocard
does not have any output attached. The computer boots up and when Linux starts
loading, the card shuts down: fans stop spinning and the LED of the logo turns
off. It's a Sapphire Radeon RX 580. If I attach the cable past this point the
card does not turn on again. Pressing keys on the keyboard, moving the mouse or
turning off and on the monitor does not awake the GPU.

> amdgpu 0000:27:00.0: amdgpu: SE 4, SH per SE 1, CU per SH 9, active_cu_number
> 36
> amdgpu 0000:27:00.0: [drm] Cannot find any crtc or sizes
> [drm] Initialized amdgpu 3.40.0 20150101 for 0000:27:00.0 on minor 0


If there's an output device attached to the videocard, then it prints this
text:
> amdgpu 0000:27:00.0: amdgpu: SE 4, SH per SE 1, CU per SH 9, active_cu_number
> 36
> [drm] fb mappable at 0xE0BEB000
> [drm] vram apper at 0xE0000000
> [drm] size 7299072
> [drm] fb depth is 24
> [drm]    pitch is 6912
> fbcon: amdgpudrmfb (fb0) is primary device
> EDAC amd64: F17h detected (node 0).
> EDAC amd64: Node 0: DRAM ECC disabled.
> Console: switching to colour frame buffer device 210x65
> amdgpu 0000:27:00.0: [drm] fb0: amdgpudrmfb frame buffer device
> [drm] Initialized amdgpu 3.40.0 20150101 for 0000:27:00.0 on minor 0

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