Hi:
See if updating the chipset and graphics drivers help.
I am assuming you are running W8 64 bit as that is what your notebook came with.
First install the chipset driver and reboot. First file listed.
http://support.amd.com/us/gpudownload/windows/Pages/raid_windows.aspx
Then run the AMD Mobility Radeon Driver Verification Tool at the link below which will find the latest graphics driver for your model's graphics configuration.
http://support.amd.com/us/gpudownload/windows/Pages/radeonmob_win7-64.aspx