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Old 09-10-05, 02:54 PM   #1
kdog
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Default fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

I'm trying to tweak my xorg settings to get more out of the Nvidia driver and hardware. I've found that if I try to use NvAGP, X just doesn't want to load. It fails with "No usable screens".

I've recompiled my kernel agpgart as modules, and confirmed it's not loading on boot. The "nvidia" driver works well, so I know the install went ok.

I found looking at the README that KT266 is supported, but I'm running a KT266A (Abit KR7A) and was wondering if maybe that was the problem. Is anyone else running this board with NvAGP enabled?
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Old 09-10-05, 03:44 PM   #2
kdog
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Well, here's a little more info. I figured out that if you recompile the kernel (agpgart as modules) it knocks out your nvidia drivers. :\

So, recompiled kernel with agpgart as modules, rebuilt nvidia drivers, added NvAGP option to xorg.conf.

Now if I startx without the agpgart modules (renamed to prevent loading) and have NvAGP set to "1", I get an error stating module nvidia can't find agpgart.ko. Hmm, why can't it use the built in?

I renamed it back, started X, which runs fine. lsmod shows:

nvidia 3706696 12
agpgart 29384 1 nvidia

So, what does this mean? It can't use NvAGP?
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Old 09-10-05, 04:00 PM   #3
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

/var/log/Xorg.0.log should tell you what's wrong, probably your chipset isn't supported by
NvAGP. But if the kernel AGP works, why would you want NvAGP? There's nothing to gain either way.

Btw, an easier way to prevent a module from loading:

echo "install agpgart /bin/true" >> /etc/modprobe.conf
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Old 09-10-05, 04:13 PM   #4
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Well, from the reading I've been doing it seems using NvAGP provides faster 2D performance for things like video and other graphic intensive apps.

My Xorg.log doesn't show any problems, and I see:

(**) NVIDIA(0): Option "IgnoreDisplayDevices" "CRT,TV"
(**) NVIDIA(0): Use of NVIDIA internal AGP requested
(**) NVIDIA(0): ConnectedMonitor string: "DFP"
(--) NVIDIA(0): Linear framebuffer at 0xE0000000
(--) NVIDIA(0): MMIO registers at 0xEA000000
(II) NVIDIA(0): NVIDIA GPU detected as: GeForce FX 5200 Ultra

I'll keep plugging away at it. Thanks for the modprobe.conf entry, that's handy to know.
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Old 09-10-05, 04:44 PM   #5
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

I'd like to see some numbers backing up that claim, since 2D video isn't using AGP at all
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Old 09-10-05, 04:53 PM   #6
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

ok, I just reread it. It doesn't say 2D specifically, it just says NvAGP is faster than agpgart.
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Old 09-10-05, 05:09 PM   #7
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Perhaps you could share the link? It really shouldn't be faster or slower
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Old 09-10-05, 05:43 PM   #8
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Hi,

you have to load agpgart.ko and the bridge-module (via-agp.ko, afair) PRIOR starting X.
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Old 09-10-05, 05:45 PM   #9
kdog
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Quote:
Originally Posted by arokh
Perhaps you could share the link? It really shouldn't be faster or slower
http://justlinux.com/forum/archive/i.../t-112117.html
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Old 09-10-05, 06:16 PM   #10
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

arokh, on an unrelated topic, how do you like that shuttle box? I've been thinking about getting one.
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Old 09-10-05, 06:18 PM   #11
kdog
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Quote:
Originally Posted by energyman76b
Hi,

you have to load agpgart.ko and the bridge-module (via-agp.ko, afair) PRIOR starting X.
Well, that's happening already. I was under the impression if the AGP from the NVidia driver was loaded, you wouldn't need agpgart at all.
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Old 09-10-05, 09:26 PM   #12
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Default Re: fine tuning NVIDIA 7676, GeForce 5200 Ultra, Abit KR7A

Quote:
Originally Posted by kdog
arokh, on an unrelated topic, how do you like that shuttle box? I've been thinking about getting one.
I like it a lot actually, although today I'd buy an SN25P/SN26P instead. Those have PCI Express, an excellent soundcard and support all the latest cpu's.

SN95G5 has some issues with the later AMD64 cores (venice), the onboard network card sucks (bad performance and needs a patch to work properly under Linux), and the ALSA driver for ALC650 is pretty bad.

Other than that, it really is a slick, cool, and high-performing machine

On topic, don't trust everything you read! That guy makes a claim without backing it up with facts.
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