[Bug 101988] blackscreen after modprobe amdgpu on R9M370X mac edition

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101988

            Bug ID: 101988
           Summary: blackscreen after modprobe amdgpu on R9M370X mac
                    edition
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: newincpp at gmail.com

Created attachment 133154
  --> https://bugs.freedesktop.org/attachment.cgi?id=133154&action=edit
dmesg after `modprobe amdgpu` and getting blackscreen

I don't know if this is specific to R9M370X - mac edition but I couldn't
reproduce it on other AMD PC I have.

This is fairly simple to reproduce, I just have to mount the amdgpu and I get a
black screen on my main screen and my main screen only (my second screen is
fine)

I don't have this problem using radeon with the exact same kernel config.
dmesg is saying everything is fine and X11 log is irrelevant because it happen
_before_ startx.
I am using Linux 4.12.4-gentoo.

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