I got an HP Pavilion laptop in 2011 with an intel i5-2540m, I believe, and a Radeon 6750 or thereabouts. For the first year I owned it, GPU switching was utterly broken and the dedicated GPU was basically dead silicon. Sometime in 2012, they released an updated BIOS that allowed changing the GPU switch logic from "dynamic" to "fixed dedicated", and that allowed you to actually use the builtin dGPU. That being said, the documented issue in TFA arises specifically when trying to exclusively use the dGPU...