[Bug 105500] AMD Richland (ARUBA) no screen at DP output when using three displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105500

            Bug ID: 105500
           Summary: AMD Richland (ARUBA) no screen at DP output when using
                    three displays
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: vinibali1 at gmail.com

Created attachment 138094
  --> https://bugs.freedesktop.org/attachment.cgi?id=138094&action=edit
dmesg

Hello there!

After connecting and enabling the 3rd monitor in D-Sub, the one with DP becames
black. Most of the time I use 2 displays with (DVI-I and DP) without any
problem. The desired layout is the following, however I even tried to use HDMI
instead of DVI-I:
 ___  __  __
|DVI||DP||DS|
  2    1  3

 __  __  ____
|DS||DP||HDMI|
  2   1   3

None of the options are working, however it's fine on Windows using the lastest
- official beta - Crimson Edition 15.7.1.
The motherboard had an ASMedia ASM1445 DVI/HDMI bridge, so I couldn't use these
outputs at the same time.

CPU: AMD A8-6500
GPU: AMD Radeon HD8570 (ATOMBIOSBK-AMD VER015.031.000.000.000000,
02/17/13,02:36:07)
MOBO: ASUS F2A85M-PRO (BIOS 6601)
OS: Arch Linux 4.13 AMD64
xf86-video-ati 1:18.0.0-1
xorg-server 1.19.6+13+gd0d1a694f-1

The logs/outputs were saved at 4.13, however it's not working with both the
up-to-date Arch (4.15) and Xubuntu 18.04 beta.

Thank you

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