I have a triple boot machine with Windows 7, Mint 13 (with XFCE) and Ubuntu 12. Only under Windows 7 does my second screen attached to a second graphics card come on. Under both Mint and Ubuntu, the second screen is blank and under my display properties I only seen on screen (the second screen enters power saving mode because it is receiving no signal).
They both show up under lshw (as well as the on-board GPU on my motherboard but I don't wish to use this).
Do I need to 'tweak' something specifically in Mint or Ubuntu to enable a second GPU?
*-pci:0
description: PCI bridge
product: Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 09
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:40 ioport:e000(size=4096) memory:f6000000-f70fffff ioport:e0000000(size=301989888)
*-display
description: VGA compatible controller
product: GT218 [GeForce 210]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a2
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:16 memory:f6000000-f6ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:f7000000-f707ffff
*-multimedia
description: Audio device
product: High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:17 memory:f7080000-f7083fff
*-pci:1
description: PCI bridge
product: Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port
vendor: Intel Corporation
physical id: 1.1
bus info: pci@0000:00:01.1
version: 09
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:41 ioport:d000(size=4096) memory:f4000000-f50fffff ioport:c0000000(size=301989888)
*-display
description: VGA compatible controller
product: GT218 [GeForce 210]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: a2
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:17 memory:f4000000-f4ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:d000(size=128) memory:f5000000-f507ffff
*-multimedia
description: Audio device
product: High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:02:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:18 memory:f5080000-f5083fff
*-display
description: Display controller
product: 2nd Generation Core Processor Family Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=i915 latency=0
resources: irq:56 memory:f7400000-f77fffff memory:b0000000-bfffffff ioport:f000(size=64)
