I set up Cinnamon 1.6 and LM14 and got Cinnamon to my liking on my dual-monitor single-GPU config and using the Nvidia drivers.
When adding a second GPU and 3rd monitor, Cinnamon reverts to a 2D layout which I am guessing is the Gnome3 fallback interface. I had the same thing with Ubuntu 12.04 with Unity which reverted to a 2D mode. Can I solve this by buying a different second video card or is it a configuration thing? Is there a command to check my GPU's compatibility with a 3d desktop environment?
These are my video cards:
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stew@Romulus ~ $ lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GF116 [GeForce GTS 450] (rev a1)
02:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce 9500 GT] (rev a1)
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# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 304.51 (buildd@batsu) Fri Oct 12 12:53:54 UTC 2012
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" 2560 0
Screen 2 "Screen2" 1280 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "1"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Microvitec PLC MV191"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "CRT-1"
HorizSync 0.0 - 0.0
VertRefresh 0.0
EndSection
Section "Monitor"
Identifier "Monitor2"
VendorName "Unknown"
ModelName "Microvitec PLC MV191"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTS 450"
BusID "PCI:1:0:0"
Screen 0
EndSection
Section "Device"
Identifier "Device1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 9500 GT"
BusID "PCI:2:0:0"
EndSection
Section "Device"
Identifier "Device2"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTS 450"
BusID "PCI:1:0:0"
Screen 1
EndSection
Section "Screen"
# Removed Option "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-2: nvidia-auto-select +1280+0"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "metamodes" "DFP-0: nvidia-auto-select +0+0; DFP-0: nvidia-auto-select +0+0; DFP-0: nvidia-auto-select +0+0; DFP-0: 1280x1024 +0+0; DFP-0: 1280x1024_60 +0+0; DFP-0: 1280x1024_75 +0+0; DFP-0: 1024x768 +0+0; DFP-0: 1024x768_75 +0+0; DFP-0: 1024x768_70 +0+0; DFP-0: 1024x768_60 +0+0; DFP-0: 800x600 +0+0; DFP-0: 800x600_75 +0+0; DFP-0: 800x600_72 +0+0; DFP-0: 800x600_60 +0+0; DFP-0: 800x600_56 +0+0; DFP-0: 640x480 +0+0; DFP-0: 640x480_75 +0+0; DFP-0: 640x480_72 +0+0; DFP-0: 640x480_60 +0+0; DFP-0: nvidia-auto-select @1280x720 +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Screen"
# Removed Option "metamodes" "nvidia-auto-select +0+0"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "CRT-1"
Option "metamodes" "nvidia-auto-select +0+0; nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "Screen2"
Device "Device2"
Monitor "Monitor2"
DefaultDepth 24
Option "Stereo" "0"
Option "metamodes" "DFP-2: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Disable"
EndSection