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-   -   Agpgart vs nvagp (http://www.nvnews.net/vbulletin/showthread.php?t=106966)

geezer 01-27-08 06:25 PM

Agpgart vs nvagp
 
I have never managed to get nvagp to work. It always falls back to agpgart whichever settings I try to use in xorg.conf, or however I compile my kernel.

This is with 2 cards - mx420 and now 6800GT and countless drivers.

What is the trick with getting nvagp to work? And would there be any benefits for games with it, or is agpgart just as good?

krionius 01-28-08 03:25 AM

Re: Agpgart vs nvagp
 
Quote:

Originally Posted by geezer
I have never managed to get nvagp to work. It always falls back to agpgart whichever settings I try to use in xorg.conf, or however I compile my kernel.

This is with 2 cards - mx420 and now 6800GT and countless drivers.

What is the trick with getting nvagp to work? And would there be any benefits for games with it, or is agpgart just as good?

there should be some compatibility list around the net about nvagp vs. different agp chipsets, or shouldn't there? I might remember wrong.

energyman76b 01-28-08 08:17 AM

Re: Agpgart vs nvagp
 
Quote:

Originally Posted by geezer

What is the trick with getting nvagp to work? And would there be any benefits for games with it,

no

Quote:

Originally Posted by geezer
or is agpgart just as good?

agpgart is just as good or even better. A long time ago, some chipsets worked with nvagp and not with agpgart. And a lot more chipset did not work with nvagp but with agpgart.

But this is long gone. Today there is no real reason to use nvagp.

pdw_hu 01-28-08 08:39 AM

Re: Agpgart vs nvagp
 
Well agpgart just locks-up for me, whereas nvagp doesn't.
If you've problems with one of them, try the other...

sjs 04-09-08 04:48 PM

Re: Agpgart vs nvagp
 
Quote:

Originally Posted by krionius
there should be some compatibility list around the net about nvagp vs. different agp chipsets, or shouldn't there? I might remember wrong.

here's one: http://ubuntuforums.org/archive/index.php/t-189933.html

I can't even start X with NvAGP set to anything except "0" (off), which tests the limits of my workstation. One 1920x1200 screen is ok but if I try to TwinView a 2nd 1920x1200 display w/o clone then I am dead in the water. If I use compiz with 2x 1920x1200 I have to kill X or do a hard reset. Running with AGP off is simply not a viable option for me.

* 2x dual-core Opteron 275, 64-bit @ 2.2GHz
* Tyan k8w s2885
* ASUS GeForce n6200 128M AGP 8x
* ubuntu hardy beta, amd64
* kernel 2.6.24 w/ agpgart & iommu support compiled in
* x.org 7.3
* nvidia driver 169.12
* gnome
* metacity and compiz fusion 0.7.0

Ubuntu ships with agpgart compiled into the kernel proper. Compiling a kernel w/o agpgart doesn't help. Nor does passing the kernel agp=off. I still have to set NvAGP to "0" to use the nvidia driver. The nv driver works fine with agpgart @ 1920x1200, but I can't use a 2nd monitor.

I tried booting a 32-bit version of Ubuntu without success, but I did not investigate that thoroughly as running a 32-bit OS doesn't tickle my fancy.

Even with AGP off I am getting Xids.

I have two similar Xids logged in succession:
Quote:

[14556.544275] NVRM: Xid (0005:00): 6, PE0000 04b4 00323232 00009ad8 00000000 00323232
[14556.549216] NVRM: Xid (0005:00): 6, PE0000 04b4 00323232 00000000 00000000 00000000
I'm going to double-check that SBA is enable in my BIOS and try it once again, but I have been at this for nearly a week.

Here's another interesting fact: I have Windows Vista dual booting and the Nvidia drivers on that side cause a BSOD before I even get a login screen (similar to Ubuntu freezing when X starts, no switching to a VT). The default driver Vista uses worked reasonably well. Could it be a hardware problem or BIOS setting we need to fsck with?

evil_core 04-09-08 07:01 PM

Re: Agpgart vs nvagp
 
Quote:

Originally Posted by geezer
What is the trick with getting nvagp to work? And would there be any benefits for games with it, or is agpgart just as good?

Yes, can can have big benefit on chipsets where kernel agp driver doesnt enable SBA or FastWrites, because in nvagp you can simply force it by adding "options nvidia NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1 to modprobe.conf", it twice FPS in some games for me. Im using it with beta(damny stable), SBA was causing many xids and hardlocks with driver 100.x.x. series. I have also "install via_agp /bin/true" in /etc/modprobe.conf(you fan find correct modue for your chipset by calling 'lsmod | grep agp'. If you are using ubuntu remember to add options also for kernel mnodule wrappers (like nvidia-new and nvidia-old).

sjs: add "Option "UseEvents" "False" to xorg.conf, its helping me with xids(new beta driver seems to have enabled it by default)


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