Just installed 11.10 64bit and followed this guide to install the latest drivers for my Radeon HD 4870.
I have a 24" and a 17" side by side. The larger screen is turned on by default, but the smaller one doesn't work unless I mirror them. When I remove mirroring, the small screen is automatically disabled. I enable it, choose a resolution, and when I press apply I get:
required virtual size does not fit available size: requested=(3200, 1200), minimum=(320, 200), maximum=(1920, 1920)
What am I doing wrong?