[all variants] AMD Dual Graphics (A-series APUs)

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http://ubuntuforums.org – I just recently built a brand new box with one of those new AMD APUs with built in graphics (it's a HTPC box so that is really plenty for graphics). I currently dual boot with Windows, and I have a Radeon HD 6450 that I've set up with the Dual Graphics. For those that don't know, AMD Dual Graphics is similar to CrossFire but utilizes the graphics in the APU and a discreet video card. My question is how well is this supported in Ubuntu? (Hardware)