OS: ubuntu 12.04
3 monitors with res: 2560x1440 X2 and 1920x1200
Video card: HD6850

I used the same xorg.conf file that worked for the fglrx driver. Replace fglrx with radeon.

I get the flowing error
[331797.662] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
[331797.662] (II) [KMS] drm report modesetting isn't supported.
[331797.662] (II) GPU only supported with KMS, using vesa instead.
[331797.662] (II) UnloadModule: "radeon"
[331797.662] (II) Unloading radeon
[331797.662] (EE) Screen(s) found, but none have a usable configuration.
Fatal server error:
[331797.662] no screens found
I actually do not understand the error and what is causing it. Any idea, Also how to fix it. I am new to ATI cards. What does KMS mean