You can disable the NVIDIA AGP module (NVAGP) through the "NvAGP" option in your X config file. This same option is used with Linux and Solaris. Its effect for Solaris is as follows:
Option "NvAgp" "0" ... disables AGP support Option "NvAgp" "1" ... use NVAGP, if possible Option "NvAgp" "2" ... disables AGP support Option "NvAGP" "3" ... use NVAGP, if possible
The default is 3.
If you are experiencing problems with stability, you may want to start by disabling AGP and observing if that solves the problems.
The following AGP chipsets are supported by the NVIDIA AGP driver; for all other chipsets it is recommended that you use the AGPGART module.
|Supported AGP Chipsets|
|Intel 815 ("Solano")|
|Intel 820 ("Camino")|
|Intel 840 ("Carmel")|
|Intel 845 ("Brookdale")|
|Intel 850 ("Tehama")|
|Intel 855 ("Odem")|
|Intel 860 ("Colusa")|
|Intel 865G ("Springdale")|
|Intel 875P ("Canterwood")|
|Intel E7205 ("Granite Bay")|
|Intel E7505 ("Placer")|
|AMD 751 ("Irongate")|
|AMD 761 ("IGD4")|
|AMD 762 ("IGD4 MP")|
|AMD 8151 ("Lokar")|
|Micron SAMDDR ("Samurai")|
|Micron SCIDDR ("Scimitar")|
If you are experiencing AGP stability problems, you should be aware of the following:
Additional AGP Information
Many Via-based motherboards allow adjusting the AGP drive strength in the system BIOS. The setting of this option largely affects system stability, the range between 0xEA and 0xEE seems to work best for NVIDIA hardware. Setting either nibble to 0xF generally results in severe stability problems.
If you decide to experiment with this, you need to be aware of the fact that you are doing so at your own risk and that you may render your system unbootable with improper settings until you reset the setting to a working value (w/ a PCI graphics card or by resetting the BIOS to its default values).
Make sure you have the latest system BIOS provided by the motherboard manufacturer.
On ALi1541 and ALi1647 chipsets, NVIDIA drivers disable AGP to work around timing and signal integrity problems. You can force AGP to be enabled on these chipsets by setting NVreg_EnableALiAGP to 1. Note that this may cause the system to become unstable.
Early system BIOS revisions for the ASUS A7V8X-X KT400 motherboard misconfigure the chipset when an AGP 2.x graphics card is installed; if X hangs on your ASUS KT400 system with NvAGP enabled and the installed graphics card is not an AGP 8x device, make sure that you have the latest system BIOS installed.