Nvidia works - but only without AGP

[Wurzel]

With Windows, AGP is working. I'm not sure, but I think I have once used a SuSE Linux and AGP also worked. My BIOS is updated to the newest version.

I've tried 2.6.18 with the option "noapic" ("acpi=off" produced a kernel panic), it didn't help.
I have also tried 2.6.17 (debian-image) with acpi=off, noapic and "NvAGP 3". Doesn't work, too.

In BIOS, APIC is enabled.
other BIOS options:

---
IPCA Yes (means ACPI on)
APM enabled
---
AGP Mode: Auto
AGP Comp Driving: Auto
AGP Fast Write: Enabled (was disabled before)
AGP Aperture Size: 128MB
AGP Master 1 W/S Write: Disabled
AGP Master 1 W/S Read: Disabled
AGP Read Synchron: Disabled
---

[Wurzel]

I finally got the problem solved.

I used the 9625-driver and a friend compared our configurations.
He noticed that links to OpenGL-Modules were set different, so we changed my links:

# cd /usr/lib/xorg/modules/extensions/
# mv libglx.so libglx.so.bak
# ln -s /root/nvidia/NVIDIA-Linux-x86-1.0-9625-pkg1/usr/X11R6/lib/modules/extensions/libglx.so.1.0.9625 libglx.so

# rm /usr/lib/libGLcore.so.1 &&  ln /root/nvidia/NVIDIA-Linux-x86-1.0-9625-pkg1/usr/lib/libGLcore.so.1.0.9625 /usr/lib/libGLcore.so.1 -s

Then I got the mistake that I mixed different versions of the nvidia driver.
So I wanted to repeat this procedure with first uninstalling the 9625-driver and then installing the 8774-driver. Therefore I had to extract the driver - usually I only use "sh ./NVIDIA-Linux-x86-1.0-8774-pkg1.run" without the option "-x".

# sh ./NVIDIA-Linux-x86-1.0-8774-pkg1.run -x
# ./NVIDIA-Linux-x86-1.0-8774-pkg1/nvidia-installer

The installation seemed to be okay as it did always. When I wanted to change the links, I noticed that the links have already been set up correct!!

So I started my X-Server and got

$ /nvidia# cat /proc/driver/nvidia/agp/status 
Status: 	 Enabled
Driver: 	 AGPGART
AGP Rate: 	 4x
Fast Writes: 	 Disabled
SBA: 		 Disabled

$ glxinfo | grep -i direct
direct rendering: Yes

I don't know why the 9625-driver did not set these links correct, or why the 8774-driver sets the links only correct if I extract it before using the installer.

btw: How can I enable Fast Writes?

$ cat /proc/driver/nvidia/agp/card 
Fast Writes: 	 Supported
SBA: 		 Supported
AGP Rates: 	 4x 2x 1x 
Registers: 	 0x1f000217:0x1f000104