Description of problem:

Dual head configuration with spanning desktop across two monitors does not detect primary monitor correctly in GDM/GNOME
DVI-I is detected as primary monitor during boot-up and upon login to KDE session.
GDM login screen and GNOME session detects monitor on DVI-D as primary.
GNOME is not detecting primary monitor correctly with DVI-I and DVI-D ports.
Looks like GDM follows the alphabetic order DVI-D as primary in RHEL 7.2 ?
But KDE does select the power-on monitor as primary.

Version-Release number of selected component (if applicable):

RHEL7.2
GNOME 3.14

How reproducible:

Always (with specific hardware)

Steps to Reproduce:
1. Boot up system in GUI mode with dual monitor.
2. On GDM screen login as user to KDE session.


Actual results:

Monitor on DVI-I is detected as primary during boot-up and in KDE session
GDM and GNOME detect DVI-D monitor as primary

Expected results:

GDM/GNOME should also detect monitor on DVI-I as primary

Additional info:

This was working well with RHEL7.1 and earlier, even with RHEL6.
Problem is specific to RHEL7.2
Problem is also specific to dual head setup with DVI-I and DVI-D ports
Configuring monitors.xml to use desired monitor as primary helps to workaround the issue.