To successfully get dual monitor working on a sony vaio k series laptop.
First you will need an A/V cable, which is identified by it's having three RCA phono connectors at one end, in the easily understood red, white and yellow colour scheme, and at the other end something like a little headphone plug, except it's got an extra ring on it. these aren't supplied but you can but them, they're known as camcorder cables.

Secondly you will need a tv or video that the laptop can detect. It won't work without one and unlike the nvidia display drivers, there's no forced detection option. How do you know if your destination device will work? you don't, you just have to try. For instance, my small TFT monitor doesn't work, but plugging the A/V cable into a V4 or my video capture card worked fine... And, you'll need it plugged in everytime you boot up intending to use dual monitor. the good news is it will remember the difference between the two setups, so you'll only have to go through this once.

1. Plug everything in and turn on your TV (or whatever the destination device is) first.

2. Turn on and keep hitting "f2" until you are taken into the BIOS screen

3. In the advanced page there is a video/graphics memory option which will probably be set to 64mb. hit the minus "- " key twice (apparently you can't just push "+", the option cycle only goes backwards not forwards) and it will cycle through 32mb and then 128mb options. select 128mb (Of course! this frees up the extra screen memory needed to run a second monitor.)

4. Save settings and exit.

5. Let Windows boot.

6. It gets a bit tricky now, because your desktop will probably be on the wrong monitor and in a funny screen resolution. Right click on the desktop, and select "properties" and click on the "settings" tab.

7. Click "advanced" and the laptop monitor properties window appears. Click the tab with the ATI logo that says "Displays"

8. Swap the identities of the monitors over using the odd little "1/2" buttons in the monitor pane. You'll only have to do it to one monitor because the other one will swap over automatically to compensate.

9. Click "apply" and "yes" on the idiot-check window that appears asking you if you're really, really, really sure you want to do this. You are.

10. Now, back in the display properties window, you can adjust the monitors to your desired resolutions in the normal manner.

Note: The hotkey option, that switches between outputs using the blue "Fn" key and "F7" is now disabled. It is now irrellevant, and makes me wonder what it was there for in the first place if it doesn't really work...

...and that's it, your away Mr. Mobile VJ