HP Elitebook 8460p Notebook.
Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz, 16GB Ram,
Single video adapter, External (displayport connected) 2nd monitor HP Elite L2201x
Using today Windows 8.1 update 1 (64Bit) with the HP provided (8.1 compatible) latest AMD video driver.
The laptop was working...