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
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1398840
Title:
dual monitors do not work on Mac Pro black cylinder
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1398840/+subscriptions
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