[Bug 107493] Screen goes blank while loading drm driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107493

            Bug ID: 107493
           Summary: Screen goes blank while loading drm driver
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: esebaro at gmail.com

I have a PC with:
MB: Asrock AM1B-ITX
CPU: AMD Kabini Athlon 5350 APU
iGPU: Radeon HD 8400 / R3 Series
Displays: DVI Asus, HDMI Samsung

Kernels: 4.12/4.14/4.15/4.16/4.17
Drivers: radeon, amdgpu, amdgpu-dc

Booting in UEFI mode, EFIFB/SimpleFB

When the drm driver is loaded on system boot or when is loaded manually the
screen goes blank. The screen content reappears after the driver has been
loaded.
I assume switching from efifb/simblefb to radeon/amdgpudrmfb causes this.

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