Yeah I have the same exact computer as Myxoh. I was having the exact same problem. Running Windows 8 64-bit. So I downloaded the Windows 7 AMD drivers from HP and at least now BOTH graphics adapters will show up in Device Manager and I can run the ATI tools that were available in Windows 7. Definitely runs up the fan alot more than the default Windows 8 drivers do for this adapter, but things run just a smidget better.
I think I'm gonna try disabling the 6620 so I can use just the 6750 as the primary and see what happens. My League of Legends loading screen seems to depend on it. It's sad too. I now have an SSD in the second drive bay and run the game off that in Windows 8 but the HDD in Windows 7 (dual-boot setup) and the **bleep** game runs faster in Windows 7. What's a man to do?
I think I'm gonna try disabling the 6620 so I can use just the 6750 as the primary and see what happens. My League of Legends loading screen seems to depend on it. It's sad too. I now have an SSD in the second drive bay and run the game off that in Windows 8 but the HDD in Windows 7 (dual-boot setup) and the **bleep** game runs faster in Windows 7. What's a man to do?