Ubuntu 11.10 64-bit with open source drivers (xserver-xorg-video-radeon 1:6.14.99~git20110811.g93fc084-0ubuntu1) with AMD Radeon HD 6470M and separate integrated Intel VGA controller. I'm having trouble with triple head, using hdmi and vga out.

I can get either monitor to come on through either extension but when trying to get both to work graphics goes crazy. Both displays are listed in GUI display manager--just don't come on as expected when changing display settings.

I can get triple head to work with AMD Radeon 5000M video adapter (same software setup) but the displays go crazy when starting vbox or Skype.

FWIW, on the AMD Radeon HD 6470M system System Info states graphics as Intel® Sandybridge Mobile while on AMD Radeon 5000M graphics are listed as Gallium 0.4 on AMD REDWOOD.

Any thoughts or advice welcome.