My Quad Monitor Workstation had been working very well with Deepin untill the latest patches. Now xrandr gives a error when I try to enable the fourth monitor. This has been reported in Deepin User Feedback. For any other members that are running Dual AMD cards this was my temporary solution.
First I reinstalled Deepin 15.1 Then I manually updated the system with the latest deepin patches using Synaptic Package Manger. Upgrading the latest patches a few at time untill I was able to isolate the problem to the xorg xserver packages. Below is a screen shot of the packages in the Deepin Patches that I had to hold back from installing.
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dance707
deepin
2016-03-10 06:12
#1
New version Deepin 15.1.1 ISO fixes Quad Monitor display issues that I had
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deepin 
My Quad Monitor Workstation had been working very well with Deepin untill the latest patches. Now xrandr gives a error when I try to enable the fourth monitor. This has been reported in Deepin User Feedback. For any other members that are running Dual AMD cards this was my temporary solution.
First I reinstalled Deepin 15.1 Then I manually updated the system with the latest deepin patches using Synaptic Package Manger. Upgrading the latest patches a few at time untill I was able to isolate the problem to the xorg xserver packages. Below is a screen shot of the packages in the Deepin Patches that I had to hold back from installing.