I upgraded recently to Ubuntu 11.10 from 10.04. I have twin Samsung 19" Syncmasters that run natively on 1680x1050, one to the DVI1 and one to the VGA1 output of my fixed dual-head integrated Intel graphics card (82G33/G31). In I was able to use xrandr in 10.04 to set my desktop size to twice 1680x1050 (3360x1050) and put my DVI output to the right of the VGA output. Now the best I can do is mirror 1680x1050, which isn't very helpful.
I've read somewhere that Intel drivers now don't support resolutions larger than 2048x2048 in either dimension. Is there any way to get around this and get back to my initial set up?