I have an Asus Pundit-R that is working pretty well with Windows 7, apart from the poor performance of the inbuilt ATI Radeon 9100IGP graphics. To try to improve on this I added a Powercolor HD2400 Pro in one of the PCI slots as a cheap upgrade.
Unfortunately, I can't disable the integrated graphics - there's no BIOS option for that (and yes, I have got the latest BIOS!). All I can do is change the priority between Integrated first and PCI second and PCI first and Integrated second.
If I have PCI first then Windows 7 does come up on the HD2400. However, there is a Code 12 error (This device cannot find enough free resources that it can use) on one of the PCI-to-PCI Bridges and the HD2400 shows up as a 'Standard VGA Graphics Adaptor' with
a Code 10 error (This device cannot start).
Alternatively, if I have Integrated first then Windows come up cleanly on the integrated adapter and I have two display adaptors available; the onboard one ('Standard VGA Graphics Adaptor' and the HD2400 ('ATI Radeon 2400 Series'). The onboard graphics are
running with the Windows 7 vgapnp.sys driver and the HD2400 is running with the latest AMD Catalyst drivers (8.661.0.0). Everything looks good in Device Manager!
However, Windows 7 then uses the onboard graphics as its primary interface (as expected) and I can't get any output at all on the HD2400. Only one monitor shows up in 'Display... Screen Resolution' and pressing the 'Detect' button fails to add the second display.
What I want to do is to get the second display running and then set Windows to use that one exclusively.
I understand that this could be the expected behaviour if vgapnp.sys wasn't a WDDM 1.x-compliant driver, but as it's part of Windows 7 then surely it must be...?
if there is no BIOS setting to disable the onboard, it should likely be auto-disabled when an add-on video card is being used. as far as the memory consumption while the add-on card is being used, that should soley controlled via the motherboard BIOS.
without that, i see no other way to disable such, other than standard methods.
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