Gnome Color Manager only lists one display device in dual monitor setup

[Alex]

I have two identical Samsung S24D300 monitors connected to an AMD 280x GPU via HDMI and DVI-D. Color manager only lists one of these two displays. I was able to calibrate the display and the resulting profile is only applied to the single display. I was able to use the command line tools to "dispcal" and "dispwin" to perform the same on the second display by using the "-d2" option.

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lsb_release -rd

Description: Ubuntu 15.10
Release: 15.10
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apt-cache policy gnome-color-manager

gnome-color-manager:
  Installed: 3.16.0-1ubuntu2
  Candidate: 3.16.0-1ubuntu2
  Version table:
 *** 3.16.0-1ubuntu2 0
        500 http://it.archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
        100 /var/lib/dpkg/status
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apt-cache policy fglrx-updates

fglrx-updates:
  Installed: 2:15.201-0ubuntu2~15.10.2
  Candidate: 2:15.201-0ubuntu2~15.10.2
  Version table:
 *** 2:15.201-0ubuntu2~15.10.2 0
        500 http://it.archive.ubuntu.com/ubuntu/ wily-updates/restricted amd64 Packages
        100 /var/lib/dpkg/status
     2:15.201-0ubuntu1 0
        500 http://it.archive.ubuntu.com/ubuntu/ wily/restricted amd64 Packages
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lspci | grep VGA

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X]
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sudo get-edid -c -q | parse-edid

AMD ATOMBIOSChecksum Correct

Section "Monitor"
 Identifier "S24D300"
 ModelName "S24D300"
 VendorName "SAM"
 # Monitor Manufactured week 36 of 2015
 # EDID version 1.3
 # Digital Display
 DisplaySize 530 300
 Gamma 2.20
 Option "DPMS" "true"
 Horizsync 30-81
 VertRefresh 50-75
 # Maximum pixel clock is 170MHz
 #Not giving standard mode: 1152x864, 75Hz
 #Not giving standard mode: 1280x720, 60Hz
 #Not giving standard mode: 1280x800, 60Hz
 #Not giving standard mode: 1280x1024, 60Hz
 #Not giving standard mode: 1440x900, 60Hz
 #Not giving standard mode: 1600x900, 60Hz
 #Not giving standard mode: 1680x1050, 60Hz
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xrandr -q

Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
DFP3 disconnected (normal left inverted right x axis y axis)
DFP4 disconnected (normal left inverted right x axis y axis)
DFP5 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080 60.00*+ 50.00 59.94
   1776x1000 50.00 59.94
   1680x1050 59.95
   1400x1050 59.95
   1600x900 60.00
   1280x1024 75.02 60.02
   1440x900 59.89
   1280x960 75.02 60.02
   1280x800 59.81
   1152x864 59.94 75.00
   1280x768 59.81
   1280x720 50.00 60.00 59.94
   1024x768 75.03 70.07 60.00
   1152x648 50.00 59.94
   800x600 72.19 75.00 60.32 56.25
   720x576 59.94 50.00
   720x480 60.00 59.94
   640x480 72.81 75.00 66.61 59.94
DFP6 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080 60.00*+ 50.00 59.94
   1776x1000 50.00 59.94
   1680x1050 59.95
   1400x1050 59.95
   1600x900 60.00
   1280x1024 75.02 60.02
   1440x900 59.89
   1280x960 75.02 60.02
   1280x800 59.81
   1152x864 59.94 75.00
   1280x768 59.81
   1280x720 50.00 60.00 59.94
   1024x768 75.03 70.07 60.00
   1152x648 50.00 59.94
   800x600 72.19 75.00 60.32 56.25
   720x576 59.94 50.00
   720x480 60.00 59.94
   640x480 72.81 75.00 66.61 59.94
DFP7 disconnected (normal left inverted right x axis y axis)
CRT1 disconnected (normal left inverted right x axis y axis)