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Old 04-09-06, 05:01 PM   #1
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Default AGP does’t work with PCI Express?

I’m experiencing some problems to enable AGP (whether in the BIOS or graphic card).

Here are the facts:
Hardware: mainboard (Asus A8N-SLI) with a nvidia 6200 TurboCache card
Nvidia driver: 1.0-8756 for Linux x86-64 on kernel
Configuration: Twinview, default depth: 24, RenderAccel is enabled, GLX is enabled.
Kernel compiled with agpgart as a module. nvidia.ko loads the agpgart.ko automatically.
Xorg.conf configured with nvAGP = 3
nNvidia-settings says Bus Type: PCI Express 16x

And here is the problem: the BIOS does not recognize AGP at boot time. The agp directory in /proc/drivers/nvidia/ does not exist. I cannot enable “Fast Write” even if I force it with the module parameter.

Glxgears (I know it’s not a real performance tool) shows 700 fps with composite and 1400 without composite. 2D and 3D applications are slow and it seems that they confirm the results of glxgears.

Can someone explain how PCI Express works? Is it a replacement for AGP? If not, how can I enable it?

Apart from the performance the system runs rock solid stable.

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Old 04-09-06, 05:09 PM   #2
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Default Re: AGP does’t work with PCI Express?

Would be easier if you just posted the nvidia bugreport as detailed in one of the stickies..
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Old 04-09-06, 05:23 PM   #3
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Default Re: AGP does’t work with PCI Express?

I'm not certain whether this is a bug or just a feature. How is PCI-Express linked to AGP? How to handle AGP in the BIOS and in X? Need to understand it from the technical point of view.
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Old 04-09-06, 08:53 PM   #4
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Default Re: AGP does’t work with PCI Express?

Think of PCI-Express as a souped up PCI bus, it just works, the AGP crap doesn't apply to you.
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