Can´t rotate 4th display -> X crash

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Hi there,

great work with version 21! After setting up a new machine I tested fedora to see if it would support 4 displays out-of-the-box as the former distro did not. I need my system to work so I can too ;)

Installes is Fedora21 on a AMD system with an onboard GPU (HD3000) and an discrete graphic card (HD5450). Connected are four displays: 2x 1680x1050 and 2x 1920x1080. Both 1920s on digital output from the HD5450 in normal orientation as well as one 1680 in pivot over VGA. The fourth screen is supported by the onboard GPU via VGA, also in pivot orentation

I was very impressed as the live system enabled all of my four displays from the get go so I installed on my SSD. The struggle started as I tried to setup the screens in the proper orientation. The 1680 on the discrete card works just fine in pivot but when i try to turn the 4th display in the settings manager it crashes my X server.

The last 4 hours I did tried to fix it and searched the web up and down. My conlcusion from this is, that it might asks too much from the virtual screen which unifies the displays in one large SCREEN. The output from xrandr all lists them in the same "screen0". I disabled it at the moment as I can´t use it in this horizontal orientation.

What I would like to ask is, if there is a way to start a second SCREEN with just the 4th display or if I can enlarge the virtual screen to support it.

#xrandr -q 

    Screen 0: minimum 320 x 200, current 4890 x 1680, maximum 8192 x 8192
HDMI-0 connected 1920x1080+1050+477 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080     60.00*+
   1600x900      59.98  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
DVI-0 connected primary 1920x1080+2970+477 (normal left inverted right x axis y axis) 476mm x 267mm
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1440x576i     50.00  
   1024x768      75.08    60.00  
   1440x480i     60.00    59.94  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
VGA-1 connected 1050x1680+0+0 left (normal left inverted right x axis y axis) 434mm x 270mm
   1680x1050     59.95*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
VGA-1-0 connected (normal left inverted right x axis y axis)
   1680x1050     59.95 +
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      59.97  
   1024x768      75.08    70.07    60.00  
   832x624 ...