[Bug 205879] New: amdgpu: blank screen on RX 460

[Bug 205879] New: amdgpu: blank screen on RX 460

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205879

            Bug ID: 205879
           Summary: amdgpu: blank screen on RX 460
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: bjo@nord-west.org
        Regression: No

Created attachment 286317
  --> https://bugzilla.kernel.org/attachment.cgi?id=286317&action=edit
dmesg 5.4.3

With a recent upgrade on Arch Linux, a bug came back which existed also several
versions before. Starting lightdm just results in a blank screen and switching
to a terminal also fails then. Booting with dc=0 works.

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[Bug 205879] amdgpu: blank screen on RX 460

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205879

--- Comment #1 from Bjoern Franke (bjo@nord-west.org) ---
Xorg logs:

    21.247] (WW) AMDGPU(0): No outputs definitely connected, trying again...
[    21.247] (II) AMDGPU(0): Output DisplayPort-0 disconnected
[    21.247] (II) AMDGPU(0): Output HDMI-A-0 disconnected
[    21.247] (II) AMDGPU(0): Output DVI-D-0 disconnected
[    21.247] (WW) AMDGPU(0): Unable to find connected outputs - setting
1024x768 initial framebuffer```

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[Bug 205879] amdgpu: blank screen on RX 460

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205879

--- Comment #2 from Bjoern Franke (bjo@nord-west.org) ---
Created attachment 286319
  --> https://bugzilla.kernel.org/attachment.cgi?id=286319&action=edit
xorg log

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[Bug 205879] amdgpu: blank screen on RX 460

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205879

--- Comment #3 from Bjoern Franke (bjo@nord-west.org) ---
Created attachment 286321
  --> https://bugzilla.kernel.org/attachment.cgi?id=286321&action=edit
dmesg with amdgpu.dc_log=1

Enabling dc_log=1 shows similarities to #200695, but only with one monitor
connected via HDMI.

[   19.548801] [drm:drm_client_modeset_probe [drm]] No connectors reported
connected with modes
[   19.548809] [drm:drm_client_modeset_probe [drm]] connector 56 enabled? no
[   19.548816] [drm:drm_client_modeset_probe [drm]] connector 60 enabled? no
[   19.548823] [drm:drm_client_modeset_probe [drm]] connector 64 enabled? no
[   19.548831] [drm:drm_client_modeset_probe [drm]] Not using firmware
configuration
[   19.548838] [drm:drm_client_modeset_probe [drm]] picking CRTCs for
16384x16384 config
[   19.548841] [drm] Cannot find any crtc or sizes

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[Bug 205879] amdgpu: blank screen on RX 460

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205879

Bjoern Franke (bjo@nord-west.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Bjoern Franke (bjo@nord-west.org) ---
Issue was caused by a loose connection. Reinserted the HDMI cable and all is
fine again.

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