HDMI dualscreen + sound

I have a Dell XPS m1330, with arch linux and xmonad. At home I got a LCD TV which I want to connect to my computer via a HDMI cable. I want to have both sound and picture and I don't want to clone the picture.
So first I want to know if it is possible? and if it is I would be very thankful for some points on how to achieve this.
Thanks in advance!

hi!
nvidia-settings can not find a monitor plugged in via hdmi port.
I got the Studio XPS 1340, so it's a dual-core card.
This is my xorg.conf:
Section "ServerLayout"
Identifier "Dell Studio XPS 1340 Layout"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/OTF"
EndSection
Section "Module"
Load "dbe"
Load "dri2"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
Load "synaptics"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "synaptics"
Option "Protocol" "auto-dev"
Option "Device" "/dev/psaux"
Option "SendCoreEvents" "true"
Option "VertScrollDelta" "80"
Option "HorizScrollDelta" "80"
Option "SHMConfig" "on"
Option "Emulate3Buttons" "on"
Option "VertTwoFingerScroll" "true"
Option "HorizTwoFingerScroll" "true"
Option "EmulateTwoFingerMinZ" "10"
Option "TapButton1" "1"
Option "TapButton2" "2"
Option "TapButton3" "3"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "de"
Option "XkbVariant" "qwertz"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LGD"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "GeForce 9500M GS"
BusID "PCI:3:0:0"
Option "SLI" "Auto"
Option "RenderAccel" "True"
Option "AllowGLXWithComposite" "True"
Option "AddARGBLXVisuals" "On"
Option "NoLogo" "True"
Option "BackingStore" "False"
Option "TripleBuffer" "True"
Option "OnDemandVBlankInterrupts" "True"
Option "RandRRotation" "True"
Option "RegistryDwords" "PerfLevelSrc=0x3333"
Option "UseInt10Module" "True"
Option "TwinView" "True"
Option "NoPowerConnectorCheck" "True"
#Option "MultiGPU" "1, yes, on, true, Auto"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "False"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection
I could really use some help on this, as nothing I plug in over the hdmi port gets recognized. It's quite annoying.
I used some settings from the wiki for the configuration of my xorg.conf.
When using this configuration I get some errors in the log, complaining about the second core (that's what I guess) not being able to be initialised by the nvidia driver. Very strange:
(II) NVIDIA(0): Primary V_BIOS segment is: 0xc000
(II) Feb 18 15:04:47 NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
(II) Feb 18 15:04:47 NVIDIA(0): enabled.
(EE) Feb 18 15:04:47 NVIDIA(0): Failed to initialize one NVIDIA graphics device!
(WW) Feb 18 15:04:47 NVIDIA(0): Failed to initialize SLI configuration. Reason: One GPU
(WW) Feb 18 15:04:48 NVIDIA(0): failed to initialize; Only one GPU will be used for this X
(WW) Feb 18 15:04:48 NVIDIA(0): screen.
(II) Feb 18 15:04:48 NVIDIA(GPU-0): Skipping Power Connector Check.
(II) Feb 18 15:04:49 NVIDIA(0): NVIDIA GPU GeForce 9400M G (C79) at PCI:3:0:0 (GPU-0)
(--) Feb 18 15:04:49 NVIDIA(0): Memory: 524288 kBytes
(--) Feb 18 15:04:49 NVIDIA(0): VideoBIOS: 62.79.3f.00.01
(--) Feb 18 15:04:49 NVIDIA(0): Interlaced video modes are supported on this GPU
(--) Feb 18 15:04:49 NVIDIA(0): Connected display device(s) on GeForce 9400M G at PCI:3:0:0:
(--) Feb 18 15:04:49 NVIDIA(0): LGD (DFP-0)
(--) Feb 18 15:04:49 NVIDIA(0): LGD (DFP-0): 330.0 MHz maximum pixel clock
(--) Feb 18 15:04:49 NVIDIA(0): LGD (DFP-0): Internal Dual Link LVDS
(II) Feb 18 15:04:49 NVIDIA(0): Assigned Display Device: DFP-0
(==) Feb 18 15:04:49 NVIDIA(0):
(==) Feb 18 15:04:49 NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
(==) Feb 18 15:04:49 NVIDIA(0): will be used as the requested mode.
(==) Feb 18 15:04:49 NVIDIA(0):
(II) Feb 18 15:04:49 NVIDIA(0): Validated modes:
(II) Feb 18 15:04:49 NVIDIA(0): "nvidia-auto-select"
(II) Feb 18 15:04:49 NVIDIA(0): Virtual screen size determined to be 1280 x 800
(--) Feb 18 15:04:50 NVIDIA(0): DPI set to (112, 112); computed from "UseEdidDpi" X config
(--) Feb 18 15:04:50 NVIDIA(0): option
(==) Feb 18 15:04:50 NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
(--) Depth 24 pixmap format is 32 bpp
(EE) Feb 18 15:04:50 NVIDIA(GPU-1): Failed to initialize the NVIDIA graphics device PCI:2:0:0.
(EE) Feb 18 15:04:50 NVIDIA(GPU-1): Please check your system's kernel log for additional error
(EE) Feb 18 15:04:50 NVIDIA(GPU-1): messages and refer to Chapter 8: Common Problems in the
(EE) Feb 18 15:04:50 NVIDIA(GPU-1): README for additional information.
(EE) Feb 18 15:04:50 NVIDIA(GPU-1): Failed to initialize the NVIDIA graphics device!
(II) Feb 18 15:04:50 NVIDIA(0): Initialized GPU GART.
(II) Feb 18 15:04:50 NVIDIA(0): ACPI display change hotkey events enabled: the X server is new
(II) Feb 18 15:04:50 NVIDIA(0): enough to receive ACPI display change hotkey events.
(II) Feb 18 15:04:50 NVIDIA(0): Setting mode "nvidia-auto-select"
Please help me out, guys

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