Disabled driver re-enabled itself automagically

[XistenZ]

The laptop have twp GPUs, one is ATI Mobility Radeon HD 5470 and the other is Intel HD Graphics.
The display stopped working, but if I connect an external monitor I can see what I'm doing, and by disabling (or uninstall completely) the driver for the ATI GPU, the laptop screen will come back on again.

Devicemanager works in mysterious ways though, if I disable the GPU, all is fine until I reboot, then I'll find it re-enabled yet again.
If I uninstall it, the computer will just install it again. I've selected the options to never install drivers automatically from Windows Update, but the computer isn't even connected to the internet it just grabs the best driver it can find and forces it to install.

I still want Windows to look for hardwarechanges and install drivers for USB-devices and such, would be a pain if those just didn't work anymore. But I'd like to tell Windows to "skip THIS particular hardware".

 

[XistenZ]

What seems to have fixed it is that the settings in (translated from Swedish, so the names might be different) "Advanced Systemsettings -> Hardware -> Settings for deviceinstallation" where you can choose to always install automagically, or not is not corresponding to what's in the registry "HKEY_LOCAL_MACHINE\SOFTWARE -> Microsoft -> Windows -> CurrentVersion -> DriverSearching -> SearchOrderConfig. This value is set to 0, 1, 2 or 3 depending on which option in the Systemsettings you chose. However as I said, these don't really talk to eachother.

What I did was I first set the registryvariable to '3', as in "don't update and never install from windows update" and then I uninstalled the driver for the ATI GPU completely and rebooted. I then set the option in Systemsettings to the first option, which is "hell yeah install everything!", and rebooted.
Here comes the interesting part, it works! It doesn't reinstall the driver, it stays in devicemanager as an unknown VGA device. The registry is set to '1' (should be 0, but at least it got changed at all so I guess SOMETIMES these two talk to eachother...) which is "install the best drivers from Windows Update". Even after being connected to the internet and inserting a USB-device to be automatically installed, it skips the ATI GPU but installs the USB-device. So everything is just the way I want. No idea for how long though...