How do I get GT425M (Optimus card) to work

I've recentely purchased a new (custom build) laptop with a nVIDIA GT425M graphics card and i5-460M processor.
This card supports Optimus, which Ubuntu (and Linux) does not support (I can live with that).
But I can't get this GT425M to work, the only gpu being used is the integrated GPU in the i5 processor.

It seems that Ubuntu does not detect the nVIDIA card at all:
$ dmesg|grep -i nouveau
[ 3.468455] nouveau 0000:01:00.0: power state changed by ACPI to D0
[ 4.625468] nouveau 0000:01:00.0: power state changed by ACPI to D0
[ 4.625480] nouveau 0000:01:00.0: enabling device (0104 -> 0107)
[ 4.625487] nouveau 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 4.625491] nouveau 0000:01:00.0: setting latency timer to 64
[ 4.629190] [drm] nouveau 0000:01:00.0: Unsupported chipset 0x0c1800a1
[ 4.629270] nouveau 0000:01:00.0: PCI INT A disabled
[ 4.629275] nouveau: probe of 0000:01:00.0 failed with error -22

$ dmesg|grep 0000:01:00
[ 1.562570] pci 0000:01:00.0: reg 10: [mem 0xfb000000-0xfbffffff]
[ 1.562577] pci 0000:01:00.0: reg 14: [mem 0xf0000000-0xf7ffffff 64bit pref]
[ 1.562585] pci 0000:01:00.0: reg 1c: [mem 0xf8000000-0xf9ffffff 64bit pref]
[ 1.562589] pci 0000:01:00.0: reg 24: [io 0x2000-0x207f]
[ 1.562593] pci 0000:01:00.0: reg 30: [mem 0x00000000-0x0007ffff pref]
[ 1.632909] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=none,locks=none
[ 1.691332] pci 0000:01:00.0: BAR 6: can't assign mem pref (size 0x80000)
[ 3.259174] vgaarb: transferring owner from PCI:0000:00:02.0 to PCI:0000:01:00.0
[ 3.468455] nouveau 0000:01:00.0: power state changed by ACPI to D0
[ 4.625468] nouveau 0000:01:00.0: power state changed by ACPI to D0
[ 4.625480] nouveau 0000:01:00.0: enabling device (0104 -> 0107)
[ 4.625487] nouveau 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 4.625491] nouveau 0000:01:00.0: setting latency timer to 64
[ 4.629190] [drm] nouveau 0000:01:00.0: Unsupported chipset 0x0c1800a1
[ 4.629270] nouveau 0000:01:00.0: PCI INT A disabled
[ 4.629275] nouveau: probe of 0000:01:00.0 failed with error -22

# lshw -c video
  *-display UNCLAIMED
       description: VGA compatible controller
       product: nVidia Corporation
       vendor: nVidia Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller cap_list
       configuration: latency=0
       resources: memory:fb000000-fbffffff memory:f0000000-f7ffffff memory:f8000000-f9ffffff ioport:2000(size=128)
  *-display
       description: VGA compatible controller
       product: Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:45 memory:fd000000-fd3fffff memory:d0000000-dfffffff ioport:1800(size=8)

$ lspci|grep VGA
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation Device 0df0 (rev a1)

./test_off.sh from http://linux-hybrid-graphics.blogspot.com/2010/07/using-acpicall-module-to-switch-onoff.html yields "failed" for everything.

The nVIDIA properitary driver was a disaster, it would left me without a X server and after uninstalling it, I had to reinstall libgl1-mesa-glx and run sudo update-initramfs -u. Not sure if it helped, but I removed newer files (touched by nvidia installer) in /lib/modules/$(uname -r) and reinstalled linux-image-$(uname -r) too (which took care of updating initramfs as well)

I've seen this thread as well: http://ubuntuforums.org/showthread.php?t=1657660, so I quited with trying to get the properietary driver to work. The BIOS does not provide me an option for switching/disabling Optimus or video cards (Phoenis SecureCore)

Running Kubuntu 10.10 64bits on a laptop.