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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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
dual monitors do not work on Mac Pro black cylinder
https://bugs.launchpad.net/bugs/1398840
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