I have been having problems with the ATI mobility radeon HD 4670 (which AMD claims should be compatible with windows 8) and have tried almost everything to fix it:
After initially updating windows 8 from 7, I was told that the ATI driver needed reinstalling - as AMD have yet to release a specific driver supported in windows 8 for this card, I downloaded the latest version (windows 7 64bit) and ran the install in Windows 7 compatibility mode. All seemed well and I was able to switch the graphics from on-board to the dedicated ATI HD 4670...
HOWEVER - when using the windows 8 metro start screen in dedicated graphics card mode (the ATI 4670), there were some serious issues with flickering screens and loading when opening most apps. When I change it back to on-board (intel) graphics - the problem disappears.
This is obviously therefore a problem with the ATI graphics card compatibility - but only it seems with the windows 8 metro interface and apps as all other programs work.
I have tried several troubleshooting guides such as these
to no avail! As well as refreshing the installation (and loosing all installed programs in the process!), clearing and uninstalling all the ATI drivers and folders then reinstalling, trying the windows 8 12.6 legacy driver (which resulted in completely black screen) - still no luck :-/
I'm not really sure if there is a solution to this other than switching the graphics to onboard when using less intensive programs and the metro interface / apps, then switching to dedicated graphics for the rest (I used to just leave it to dedicated graphics in windows 7 as I use intensive graphics and 3D CAD programs most of the time).
I don't really want to resort to this and it would be a shame to revert back to windows 7 simply due to this problem. Therefore, any suggestions would be greatly appreciated and many thanks in advance!
Model: Acer Aspire 8935
OS: Windows 8 Pro (previously Windows 7 Ultimate 64bit)
Processor: Intel Core2 Quad Q9000
Graphics: ATI Mobility Radeon HD 4670 (dedicated)
Graphics: Mobile Intel 4 Series (onboard)
RAM: Corsair Vengeance 8GB (X2 4GB @ 1600MHz