#784313 /usr/bin/xrandr: xrandr does not list third monitor on second graphics card

Package:
x11-xserver-utils
Source:
x11-xserver-utils
Description:
X server utilities
Submitter:
Steven
Date:
2015-05-05 08:45:06 UTC
Severity:
important
#784313#5
Date:
2015-05-05 08:35:34 UTC
From:
To:
Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?

Installation of a second graphics card with a third monitor. The primary
graphics card has two monitors attached and running.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

~$ xrandr

   * What was the outcome of this action?

Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 8192 x 8192
VGA1 connected 1280x1024+1920+0 (normal left inverted right x axis y axis)
338mm x 270mm
   1280x1024     60.02*+  75.02
   1024x768      75.08    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   640x480       75.00    72.81    66.67    60.00
   720x400       70.08
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 160mm x 90mm
   1920x1080     60.00 +  50.00    59.94*
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.88
   1280x1024     60.02
   1440x900      59.90
   1280x960      60.00
   1280x800      59.91
   1280x720      60.00    50.00    59.94
   1024x768      60.00
   800x600       60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       60.00    59.94

   * What outcome did you expect instead?

There should be an additional VGA.
lspci list it:
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV530
[Radeon X1600 XT/X1650 GTO]

*** End of the template - remove these template lines ***