Found this link in the German forum, give it a try, maybe it helps...

Thanks for the other examples of this hack. No example worked for the GA version of Win 7.

I'm pleased with how well Win 7 kept puting my system back together after I would hose it with legacy drivers.

I'm stopping now and letting Standard VGA do it's best. Here's how it pans out:

Dock and undock - only works if I heibernate - OK
Dual Display - No dice - Will do without
Control to external display - Not working

-Mike

Hello to all. If anybody still have interest.. I found this solution http://www.groundstate.net/855GMWin7.html
I try it and video now working like a champ! It very simple to use. No need many restart's or anything else. Everything work's great with this solution for me. No problems with video driver at all.

As an additional tip:

In Win 7 System Configuration Administrative Tool, Boot tab, tick "OS boot information".

This essential tip came from a brilliant Indian. Please forgive my inability to provide complete attribution.

Without this tip, Win7 blue-screened at the "three glowing ball" boot screen. The essential tick skips the offending boot screen.

Ticking "No GUI Boot" may also skip the offending boot screen. After my system worked, testing alternative solutions was beyond my interest and risk profile.

My X40-2371, 1.5Gb RAM, Kingspec SSD, runs Win7 with Intel graphics driver version 6.14.10.4656. Device Manager redundantly describes the display adapter as:
Intel(R) 82852/82855 GM/GME Graphics Controller (Microsoft Corporation - XDDM)

With the installation of a functional graphics driver, Win7 improves X40 performance, especially boot time.

My disappointment is that Lenovo began constraining various ThinkVantage installers so that Win7 versions no longer install on a X40. Constrained ThinkVantage installers are consistent with planned obsolescence: inconsistent with extending the utility of installed machines.

The IBM "lowest total cost of ownership" promise prompted my switch from Toshiba to ThinkPad. Constrained ThinkVantage installers betray the "lowest total cost of ownership" promise.

Lenovo cannot guarantee that Win7 ThinkVantage utilities will function on a X40. Some users install Win7 without properly fudging a functional graphics driver--notwithstanding the possibility of a Lenovo-adapted Win7 graphics driver for X40--unless Lenovo acts with Intel to enforce planned obsolescence.

However Intel may control graphics drivers ... when Lenovo constrains ThinkVantage installers, Lenovo independently enforces planned obsolescence.

Instead of silently constraining ThinkVantage installers, Lenovo could display a warning, then force each user to accept the risks (and benefits) of Win7 ThinkVantage utilities on an X40, explicitly without Lenovo support or guarantee. This alternative would allow users to extend the utility of older machines, clearly at user risk, to the extent ThinkVantage utilities add value.

Maybe I could hack ThinkVantage installers to overcome the X40-Win7 constraint ... except ThinkVantage utilities do not add as much value as before. This realization liberates my return to Toshiba.

My X and T Thinkpads have needed a replacement CPU fan, a replacement graphic connector and a replacement keyboard. My even older Toshiba Portege and Tecra keep running with only a replaced keyboard.

Does anybody actually use x40 with win7? Is it worth going this way, or device is slow. My father uses x40, and i own new, unpacked 32GB SSD for it. So I dont know which way to go - give him the SSD to use with Win7 or just sell it