If you're using ATI...you can run the card in Dual Head mode. Install the ATI proprietary driver and control panel, go into the control panel, enable dual screen, extend desktop horizontally, logout and log back in. You're set.

There also a thread about setting it up at linux questions: http://www.linuxquestions.org/questi...ad.php?t=40125

If you aren't using ATI, It's possible but difficult...

http://www.tldp.org/HOWTO/Xinerama-HOWTO/

There are a couple of caveats to it as well...such as different resolutions on different monitors, etc. If you're looking for a good window manager that is Xinerama capable..try enlightenment.

ya, i have all of that stuff set up (i'm using FGLRX ATI properity device to set up my dual monitors), i'm just trying to make 3D graphics run faster and smoother. i have the hardware accelerator installed but it doesn't make a lot of difference, only two more FPS. so i was just wondering if there is some way to configure Xscreensaver to set the screens to "clone" mode so that there is less data so it will run faster, and then switch out of clone mode when i get out of it. or if someone just knows of a good hardware accelerator for an ATI graphics card (radeon X600) because the one i have installed doesn't work too well.