SiS 648 chipset and AGP 8X support issue...

[Yehonadav]

After installing Nvidia's software for Linux and pulling up the settings, I noticed that it says it's only AGP 4X enabled. Now my motherboard Asus P4S8X supports AGP 8X and I used the 8X on Windows before I switched to Fedora Core 4 (by the way I'm using kernel-2.6.15-1.1831_FC4). So after doing some research I saw where I could check to see if both the card and the host-bridge supported fast write (which I believe is what 8X is, but if I'm wrong forgive me). The card supports fast write (Nvidia GeForce 5800 Ultra), but it says the host-bridge does not. Now my motherboard came with drivers for my Lan card, AGP slot, and IDE, unfortunately they are for windows. I'm not sure what to do from here, because I would like to get the host-bridge to support 8X AGP and also to have the best drivers for my hardware (I've noticed my internet is no where near as fast as it was on Windows). Would appreciate any help, resources, etc. Thanks!

[imdeemvp]

There is an old thread about same issue. I think it's kernel related if I recall it right. Now, what about your bios? is the setting correct?

[Yehonadav]

There is an old thread about same issue. I think it's kernel related if I recall it right. Now, what about your bios? is the setting correct?

Yes I checked the bios settings and AGP 8X and Fast Write are both supported and enabled. What now?

[Yehonadav]

Below is what the feedback was from the system after I typed the commands. As you can see the card supports it all, but the host-bridge says it doesn't and only supports 4x, now like I said the AGP slot supports 4x and 8x, and I used it on 8x when I had Windows. How do I get the system to recognize that the slot does support Fast Write and 8x? I got rid of dri loading under 'modules' and added options to enable 8x and Fast Write under the Device section of xorg.conf, but still no dice. Reallllllllllly hope you can help. Thanks!

[root@localhost ~]# cat /proc/driver/nvidia/agp/card
Fast Writes: Supported
SBA: Supported
AGP Rates: 8x 4x
Registers: 0x1f000e1b:0x1f004301
[root@localhost ~]# cat /proc/driver/nvidia/agp/host-bridge
Host Bridge: PCI device 1039:0648
Fast Writes: Not Supported
SBA: Supported
AGP Rates: 4x
Registers: 0x1f004e09:0x00000f01

[Yehonadav]

Had to reload "dri" as when I deleted it as loading as module, my internet was extremely slow. But once I reloaded it my internet was much faster, though still not as fast as it was on Windows, which I still think is that the driver that the kernel is using isn't the best one, which I hope to find drivers for my P4S8X motherboard. Went to both Asus' and SiS's websites and either couldn't get the drivers to download, or they only offered them for Windows. Thanks again for any help you can offer.

[Yehonadav]

Well here's an update:

I custom compiled the fedora kernel to get rid of agpgart support (and tweaked it to my liking which I had never done before), but still it kept only recognizing 4x agp and fast write disabled. So then I custom compiled the nvidia driver and enabled it to force into 8x agp mode and force it to enable fast write, but still the same result. At this point, I just don't know what to do. I've researched for hours and spent hours changing things around with no avail. The irritating thing is that my BIOS, the AGP slot on my motherboard, and my GeForce FX 5800 Ultra graphics card all support 8x AGP. Help! LOL!