Acer X233H LCD resolution problem

Hi,

I have problem setting right resolution for new LCD Acer X233H with SFF Dell GX-280 with
Intel® 82915G/82910GL.

LCD info page says that it should be 1680-1050 (expected) but on my PC I can do only 1400-1050.
As I've check my video with 128M should support up to 2048x1536 at 85 Hz maximum resolution ( from link at the bottom).

And most interesting part that I could get this 1680-1050 resolution on another LCD Samsung T220. I could see this option both in Property and Display Control screens.

In both cases I used D-sub with windows XP.
Anybody can suggest how to get it fixed, should I play with drivers.
I also played with Acer LCD setting with no success.

Tx to all
Dai

reference links:
http://shopping.msn.com/specs/acer-x233h-23-widescreen-...
http://www.intel.com/support/graphics/intel915g/sb/CS-0...