How to change the AGP speed

Kr0m · 07-08-2004, 12:03 AM

I was wondering what the steps are in order to change my AGP speed from 4x to 2x.
I recently installed the latest ATI drivers (with some help of cource, I'm a n00b) and as far as I can tell, it has AGP enabled at 4x, which my vid card and motherboard are only compatible with each other at speeds of up to 2x. If someone could give me some step by step instructions on how to change the speed from 4x to 2x I'd appreciated it. Thanks.

Mandrake 10.0

dalek · 07-08-2004, 01:09 AM

I can change mine in the BIOS. You may want to check there and see if you can change yours there to. I can't recall what it is under though. Most are usually set to auto, like everything else.

Hope that helps.

Kr0m · 07-08-2004, 01:18 AM

Yeah, I've checked there, there's no option to set it.
I guess I should post some specs too.
It's a low end system....
Motherboard: ECS K7SEM w/ SiS 730s chipset
Processor: AMD Duron XP 1266MHz
Video Card: ATI Radeon 9200SE 128MB
RAM: 768MB SDRAM
BIOS Type: AMI , System BIOS date: 03/18/03 , Video BIOS date: 03/11/18

Electro · 07-08-2004, 01:37 AM

You can try adding Option "AGPMode" "4" in the device section in your XF86Config or XF86Config-4. If you are using drivers from ATI, you should check with modinfo first. If modinfo shows an agp setting for your ATI module (driver), you can place a line in the modules.conf file. Something like:

options radeon module_options other_module_options

You can check if AGP is set right by looking in the proc directory.

motub · 07-08-2004, 04:13 AM

Quote:

Originally posted by Electro
You can try adding Option "AGPMode" "4" in the device section in your XF86Config or XF86Config-4.

Don't you mean "AGPMode" "2"?

But yes, that ought to do it, although I never found that ATI's AGP settings (under Windows or Linux) ever really affected the BIOS settings, or the speed at which the AGP bus actually ran. Are you (Kr0m) actually experiencing display corruption or other problems due to this setting being inconsistent?

That asked, I prefer my settings to be consistent as well, so that the driver knows what it's in fact doing, so you might as well change it in the config file.

Kr0m · 07-08-2004, 06:44 AM

Well, when it set to 4X AGP by default in Windows, games like Quake 3 Arena would lock up, causing me to reboot. After doing some research, I found out about my vid card and motherboard incompatibility issues. Switching it to 2X AGP fixed it for me, in Windows.
After installing the ATI drivers, doing the appropriate steps etc... Quake 3 and just doing regular tasks cause the machine to lock up (just like in Windows when it was set at 4X).

So in order for me to change the AGP speed all I have to do is edit my XF86Config-4 (I think this is in /etc/X11 ) and add "AGPMode" "2" ?

motub · 07-08-2004, 07:06 AM

As far as I know; assuming that your BIOS is set correctly to run the AGP bus at 2X.

vectordrake · 07-10-2004, 02:33 PM

I just got through that myself recently with my Rage 128 Pro AGP 4x. The X drivers had it enabled at 1x mode, though. I set it to 2x. Here's my stanza:

Code:

Section "Device"
    Identifier  "** ATI Rage 128 based (generic)       [r128]"
    Driver      "r128"
    Option      "AGPMode"       "2"
    Option      "UseCCEFor2D"   "false"
    #VideoRam    32768
    # Insert Clocks lines here if appropriate
EndSection

That should do the trick. Where in NB are you (email me if you don't want it totally public)?