blackscreen after modprobe amdgpu on R9M370X mac edition

Submitted by new..@..il.com

Assigned to Default DRI bug account

Link to original bug (#101988)

Description

Created attachment 133154
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.

Attachment 133154, "dmesg after modprobe amdgpu and getting blackscreen":
dmesgamdgpu