Deactivating Radeon HD3200 on my Notebook

Hi everyone,

i've recently installed Win7 Ultimate (x64) on my ASUS-Laptop (M51Ta). Have to say, much much better than my old Vista (which eventually succeded in completely crippling my system)

There is just on little snag - i can't seem to get my ATI Radeon Mobility HD3650 to work as my primary GPU when i connect to my external monitor.

Windows shows both devices, the integrated HD3200 and the HD3650 as working and active, but i cant switch between the two of them.

With just my laptop monitor, i can work around this problem by deactivating the display that uses the HD3200 (Windows creates a seperate display für each GPU)

However, when i connect to the external monitor, it uses the HD3200 instead of the HD3650. When i try to deactivate the display using the HD3200/switch to the HD3650, the screen just goes dark.

When i try to deactivate the HD3200, it seems to work, until i restart my laptop - then it seems to be using the standard VGA drivers (altough it still has both of my GPUs as working and correctly installed in the device manager).

Any Ideas what is going on here?

Slowcoach, welcome to the forums.

Think you will find what is happening is that the onboard 3200 is the default and most likely hardwired to the external port, and that is why you can't get an external monitor to run off the 3650.

Might want to have a read here,

Asus M51Ta Owners' Lounge

and see what other owners of the same laptop have to say (48 page thread).

Hi stormy13, thanks for the warm welcome

i forgot to mention, that before switching to Win7 had no problem running my 3650 on the external monitor (you can always tell when the 3200 is running by the awful game performance:))

I somehow cant switch between the two of them like i used to. Even after installing Power4Gear Hybrid (for x64 Win7).

And ATI PowerXpress doesnt allow me to switch either....
It recognizes the two GPUs just fine, but switching...