Fedora 25->26 upgrade kills second monitor: arandr also stops working

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Hello,

My second monitor has stopped working after an upgrade to Fedora 26 using dnf system-upgrade. 

Also, arandr is busted: here is what I get.

$ arandr 
Traceback (most recent call last):
  File "/bin/arandr", line 42, in <module>
    main()
  File "/usr/lib/python2.7/site-packages/screenlayout/gui.py", line 318, in main
    force_version=options.force_version
  File "/usr/lib/python2.7/site-packages/screenlayout/gui.py", line 157, in __init__
    self.widget = widget.ARandRWidget(display=randr_display, force_version=force_version)
  File "/usr/lib/python2.7/site-packages/screenlayout/widget.py", line 48, in __init__
    self._xrandr = XRandR(display=display, force_version=force_version)
  File "/usr/lib/python2.7/site-packages/screenlayout/xrandr.py", line 42, in __init__
    raise Exception("XRandR 1.2/1.3 required.")
Exception: XRandR 1.2/1.3 required.

And here is the output from xrandr:


$ xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DVI-I-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 519mm x 324mm
   1920x1200     59.95*+
   1600x1200     65.00    60.00  
   1400x1050     74.76    59.98  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.05    60.04    75.03    70.07    60.00  
   960x720       75.00    60.00  
   928x696       75.00    60.05  
   896x672       75.05    60.01  
   832x624       74.55  
   800x600       75.00    70.00    65.00    60.00    72.19    75.00    60.32    56.25  
   700x525       74.76    59.98  
   640x512       75.02    60.02  
   640x480       60.00    75.00    72.81    75.00    59.94  
   720x400       70.08  
   576x432       75.00  
   512x384       75.03    70.07    60.00  
   416x312       74.66  
   400x300       72.19    75.12    60.32    56.34  
   320x240       72.81    75.00    60.05  
DP-1 disconnected (normal left inverted right x axis y axis)

Why is the second one disconnected above? It was fine (and connected) before the upgrade. 

Any suggestions as to what I should be trying?

Many thanks for your help, and best wishes,
Ranjan

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