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[Josh Cogliati <jjcogliati-r1@xxxxxxxxx>]

For what it is worth, dual monitors work in Fedora 21.

$ xrandr -q
Screen 0: minimum 320 x 200, current 3280 x 1200, maximum 16384 x 16384
DisplayPort-6 disconnected (normal left inverted right x axis y axis)
DisplayPort-7 disconnected (normal left inverted right x axis y axis)
DisplayPort-8 disconnected (normal left inverted right x axis y axis)
DisplayPort-9 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
DisplayPort-10 connected 1680x1050+1600+0 (normal left inverted right x axis y axis) 433mm x 270mm
   1680x1050     59.95*+
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      59.97  
   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  
DisplayPort-11 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-3 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-4 disconnected (normal left inverted right x axis y axis)

# lshw -C display; lsb_release -a; uname -a
  *-display               
       description: VGA compatible controller
       product: Tahiti LE [Radeon HD 7870 XT]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:47 memory:80000000-8fffffff memory:a0700000-a073ffff ioport:3000(size=256) memory:a0740000-a075ffff
  *-display
       description: VGA compatible controller
       product: Tahiti LE [Radeon HD 7870 XT]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:06:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:49 memory:90000000-9fffffff memory:a0600000-a063ffff ioport:2000(size=256) memory:a0640000-a065ffff
LSB Version:	:core-4.1-amd64:core-4.1-noarch
Distributor ID:	Fedora
Description:	Fedora release 21 (Twenty One)
Release:	21
Codename:	TwentyOne
Linux inl426935 3.17.8-300.fc21.x86_64 #1 SMP Thu Jan 8 23:32:49 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1398840

Title:
  dual monitors do not work on Mac Pro black cylinder

Status in xorg package in Ubuntu:
  New

Bug description:
  How do I get dual monitors working on a Mac Pro cylinder? I have two
  thunderbolt connected displays (one on a minidisplay port to dvi
  connector, and the other on a mini displayport to vga connector). If I
  plug only one in, it works. If I plug both in at boot up, than one of
  them will work randomly, and the other will not work at all.

  xrandr -q only shows the working one:

  $ xrandr -q
  xrandr: Failed to get size of gamma for output default
  Screen 0: minimum 1600 x 1200, current 1600 x 1200, maximum 1600 x 1200
  default connected primary 1600x1200+0+0 0mm x 0mm
     1600x1200      77.0* 

  I am using the kernel parameter nomodeset or video does not work at
  all.

  I am trying on Ubuntu 14.04 with kernel 3.13.0.39.46.

  # lshw -C display; lsb_release -a; uname -a
    *-display UNCLAIMED
         description: VGA compatible controller
         product: Tahiti LE [Radeon HD 7870 XT]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:02:00.0
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress msi vga_controller bus_master cap_list
         configuration: latency=0
         resources: memory:80000000-8fffffff memory:a0700000-a073ffff ioport:3000(size=256) memory:a0740000-a075ffff
    *-display UNCLAIMED
         description: VGA compatible controller
         product: Tahiti LE [Radeon HD 7870 XT]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:06:00.0
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress msi vga_controller bus_master cap_list
         configuration: latency=0
         resources: memory:90000000-9fffffff memory:a0600000-a063ffff ioport:2000(size=256) memory:a0640000-a065ffff
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description: Ubuntu 14.04.1 LTS
  Release: 14.04
  Codename: trusty
  Linux inl426935 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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