higher resolution on external monitor with i810

[yoav]

Hi,

I have a Sony Vaio PCG-SRX87p running FC1. The latop has a 10.4" screen that supports resolutions up to 1024x768. I recently bought an LCD with a resolution of 1280x1024 that I want to use as an external monitor, but I was unable to get any resolution higher than 1024x768. The video card is an Intel 815 card, and I tried with both the i810 and the vesa drivers. I was able to turn the laptop monitor off, using the i810rotate command, but still, if I try to set the XF86config to a default resolution of 1280x1024, I just get a blank screen.

Any ideas?

Thanks,
Yoav