[Bug 99779] Lenovo Thinkpad E450 (Kaveri A6-7000 Radeon R4) Blank Screen after suspend (displayport link issues)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99779

            Bug ID: 99779
           Summary: Lenovo Thinkpad E450 (Kaveri A6-7000 Radeon R4) Blank
                    Screen after suspend (displayport link issues)
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: brookskd at gmail.com

Created attachment 129527
  --> https://bugs.freedesktop.org/attachment.cgi?id=129527&action=edit
dmesg 4.9.8

If I shut my laptop lit it suspends, then when opening the lid and resuming I
get a blank screen and am unable to get the display to work again unless I
reboot.  I can ssh into computer and I get displayport link errors in the
attached dmesg log.

This issue does not occur if I use the radeon kernel module instead of amdgpu.

This seems very similar to bug 90320 but I filed this one because it is amdgpu
not radeon:
https://bugs.freedesktop.org/show_bug.cgi?id=90320

I've also attached the Xorg.0.log but it does not have any errors indicated. 
It indicates successful exit because I stopped the server over ssh and tried to
restart gdm a few times which is why there are multiple displayport link status
failed messages in dmesg.

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