30 inch screen on T60 with X1300 graphics card: impossible?

[ashirusnw]

y Thinkpad T60 (2613-CTO) has a Ati Radeon Mobility X1300 video card and I'm trying to use it to drive a 30 inch HP screen (a HP LP3065).

From browsing these forums I discovered I needed at least the Advanced Mini Dock to provide dual-link DVI output to drive this beast so I've got that but I can only drive it at half its real resolution 1280x800 intead of 2560x1600. This screen only provides full resolution or exactly half - there's no scaling.

Can I get this video card to display at the full 2560x1600 resolution? 

I've tried disabling the main laptop LCD so it could provide some oomph to the external 30" HP one but Windows and the ATI Catalyst Control Ctr refuse to list the full-res mode. Is it there anything I can do? I prefer not buying a Advanced Dock and fitting a desktop PCI-E video card - too expensive. I would very possibly consider a motherboard upgrade (=video card upgrade) if it was the only way to go and not too expensive and would definitely work.

Here are the spec of the Ati Mobility X1300 (note its the mobility edition, not the PCI-E one):
Driver version: 7.01.01.646
Identity: ATI Display controller
Memory clock: 319.50 MHz
Engine clock: 391.50 MHz

It has only 64 dedicated RAM but apparently it can grab some off the system RAM (3GB) when it needs to.

Anyone have any ideas?
Ash

FYI I have already posted this on the competiing forum but not got any knowledgable response so I'm hoping this community knows more.

[lead_org Microsoft MVP Contributor]

it is not about the oomph or this. It is whether your video card support Dual Link output on the dock. Do you have the dual link dvi cable from the HP LCD, so i gather that it is not working?

If you need a cheap solution. Do the DIY Vidock upgrade, and get a cheap desktop grade video card. 

Google DIY vidock on notebookreview.com, there is an detailed tutorial on this. You can do it for around 200 USD max.