[Bug 97249] R290x combined with Mg279q, Dp link fail in ubuntu, in multihead setup.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97249

            Bug ID: 97249
           Summary: R290x combined with Mg279q, Dp link fail in ubuntu, in
                    multihead setup.
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: ramsland at hotmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Epuigpment: CPU Amd fx8350, Mboard: Gigabyte GA-990FXA-UD3, Ram 16 gb. Sapphire
R9 290x. 
Monitor setup:  2 monitors, 1 right side (DP-0) Asus MG279q, 1
left(HDMI-0)pb279. Both are 1440p monitors, with the Mq279q have high
refreshrate 144hz.
Using randr for multihead.

OS: Ubuntu 16.04, kernel 4.4.0-31-generic
PPA:Obiaf.

Problem: The right screen is blank, as long as I try to use standard
resolution, meaning 1440p. Can only get it to work in 1080p, at 60hz. It worked
perfectly in the old fgrlx when running ubuntu 14.4, and with radeon in ubuntu
14.4, though it might have been both screens at 60hz with the radeon driver. 
When trying with livecd's, the fedora 24 is working at 1440p at 60 hz, but
fails if i try to increase the refresh rate. 
Ubuntu live 16.04, fails the same way as my install.

I think its releated to the radeon driver, but i cant be sure.

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