I have read through this thread and I cant seem to get mine working at all!
I have a HP envy with a Intel HD 4000 onboard and a Radeon HD 7670M, win8 64bit
I purchased my laptop in December and only just found out it has never ran on the Radeon 7670M.
I have tried updating drivers for Radeon 7670m in device manager. Still dxdiag display shows intel 4000. In catalyst control and Configure switchable graphics all I can do is assign high performance or low performance to .exe files. If I assign high to dxdiag.exe it still does not work. I have tried disabling the on board card and dxdiag then shows microsoft basic display driver and then I get a error message after a while saying AMD drivers are not install or running correctly please install. I have tried uninstalling 76070 from device manager, and uninstalling with the AMD driver installation files. Rebooted, tried installed drivers from AMD and HP and still does not work. It seems to have this switchable function that does not work. Someone on HP forum said to try the older drivers on the HP site. I have done that and still exactly the same issue.
I have tried installing the Intel drivers as well but still does not work. Another suggestion was to go into BIOS and turn switchable graphics to 'fixed' but I don't have that option. I updated the BIOS from HP site but still have no option to do that in mine. I have tried installing many versions of AMD catalyst as someone who had it said there's shows switchable graphics and then gives them the option for high performance GPU or low performance GPU and shows you your current GPU that is being used but mine only shows options to assign high or low performance to .exe files which if you assign high or low it still uses the on board Intel 4000 card. I have tried different versions of AMD catalyst, drivers and what not and nothing seems to work. Please can someone help me with this.