Filed from caserun (https://tcms.engineering.redhat.com/run/274911/#caserun_11913996)

Version-Release number of selected component (if applicable):
RHEL-6.8-20160406.n.0
xorg-x11-server-Xorg-1.17.4-9.el6.x86_64
xorg-x11-drv-intel-2.99.917-0.4.20151111.el6.x86_64
kernel-2.6.32-638.el6.x86_64
package linux-firmware is not installed
package mesa is not installed
mesa-dri-drivers-11.0.7-4.el6.x86_64
package xorg-x11-glamor is not installed


Steps to Reproduce: 
 1. Connect as many displays as you can to the available ports on your display
    adapter.
 2. Ensure the 'nomodeset' kernel parameters are not set in your bootloader
    configuration.
 3. Ensure the file /etc/X11/xorg.conf does not exist, or is a valid file that
    uses the valid driver.


 1. Verify that the graphical environment starts correctly and is spanned
    across all connected displays
 2. Open a console and run the command xrandr. Take a copy of the results.
 3. Disconnect and then re-connect one or more displays; do this several times.
    If you are using a docking station for a laptop, try removing the laptop
    from and restoring the laptop to it several times.
 4. Run your gnome-display-properties. Verify that it correctly shows each of
    the connected displays (monitors). Test re-arranging, enabling, disabling
    and configuring displays.



Actual results: 
VGA output seems nonexistent. No effect on hotplug and curiously seems to be completely absent in xrandr output:
[root@dhcp40-146 ~]# xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  50.00    59.94  
   [...]
DP2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  50.00    59.94  
   [...]

Expected results:
Both X and the graphical environment should cope smoothly with displays being
disconnected and reconnected while the system is running: the displays should
be correctly added or removed by X, and the graphical environment should
correctly adjust itself to the added or removed display

Configuration tools should allow you to arrange the displays in any
configuration, enable and disable displays, and change each display's settings;
these changes should work and be reflected in what each display actually shows