15-n067sr problems with AMD Radeon HD 8670M (windows 8.1 x64)

Hello, 

below i'll explain the problem i'm experiencing. 

I've decided to install Windows 8.1 x64 to this notebook model (15-n067sr). The problem is that ATI drivers which i download from HP support site doesn't allow me to install Display driver, it only installs OEM profile or something like that + Installer. No display driver, no CCC, not anything else. And it doesn't matter if i choose quick install or personalized. I've tried deleting all the ATI, Intel and chipset drivers and reinstalling them one by one. First chipset, then Intel and then ATI and still Installer won't let me setup any data which is needed for correct performance. 

Anyway, i tried to install 14.9 Catalyst from AMD website, also tried beta drivers and actually they install correctly and i can switch between 2 video GPU's and everything seems fine EXCEPT ONE THING : the notebook won't come back from sleep mode , hybernation mode or when the display switches off. I've tried to manipulate with energy options , but still no result. With AMD display driver installed (from official website) the notebook never resumes correctly from these modes, i guess they just don't work at all, display just becomes black and nothing else happens. 

Yes, i've updated my BIOS. 

No, with these drivers from HP i can't switch between GPU's and only Intel GPU works actually, i've checked that in TechPower GPU-Z. 

I guess i've tried everything possible, but if you can think of any other solution - please let me know, because i can either play games normally and use both GPU's but it's impossible to work with notebook, because sleep and hybernation modes doesn't work, either i can work without any problems, but my AMD GPU isn't avalible. 

Thanks in advance.