text: Ubuntu :: Unable To Use Separate X Servers Mode For Dual Monitors
  Prior to upgrading to 11.04 from 10.10, I was using the Seperate X Servers option in nvidia-settings for handling my dual-monitor setup. This mode enabled both monitors to be fully independent, running their own WM and having their own virtual desktops. This was convenient for me as I could keep my web browser on one virtual desktop on one screen, and switch to other virtual desktops without losing it. However, since upgrading to 11.04, this mode no longer functions properly.