[Bug 96768] Black screen past login with RX 480, Ubuntu 16.04 and AMDgpu-pro 16.30

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96768

            Bug ID: 96768
           Summary: Black screen past login with RX 480, Ubuntu 16.04 and
                    AMDgpu-pro 16.30
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu-pro
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: pyrignis at gmail.com

Created attachment 124845
  --> https://bugs.freedesktop.org/attachment.cgi?id=124845&action=edit
output of the dmesg command

Symptoms:
Login screen renders properly
Past login, the screen turns black, with the pointer visible and a blank pixel
in the upper left corner.
On some occasion the pointer turns from the arrow to the vertical bar.
crtl+alt+F<whaterver> works and brings the user to the tty.

all symptoms are reverted when the llvm driver is used.

System:
Ubuntu 16.04 Gnome edition (but even with unity installed and configured as
default the symptoms are the same)
AMD Radeon RX 480 8G
AMDgpu-pro 16.30
4.4 kernel

The dmesg file is the output of the command after a tty return with
ctrl+alt+F4.

original description here:
https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/amd-linux/881991-rx-480-on-ubuntu-has-anyone-been-able-to-use-it

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