View Full Version : Video Card IRQ conflict?
10-24-2000, 04:03 PM
I am trying to install a Creative Labs Riva TNT2 PCI card (32MB) in my machine and having no luck. My motherboard has an 8MB AGP chip on it, which I believe I've disabled through the CMOS Setup. However, when I start Windows with the monitor plugged into the RIVA's port, the system hangs every single time. I've looked at IRQ conflicts, and there are 3 devices sharing IRQ11- the Video Card (which, by the way, is plugged into Slot 1 on the mobo), my modem, and my extra parallel port (which are all plugged into PCI slots).
I want to be able to use this video card, but I'm running out of options here!!! Please help!
10-24-2000, 11:49 PM
If I understand it right, that's the way PCI IRQ steering works. The PCI devices can use one IRQ, and not have conflicts, since IRQ steering routes the signal back and forth to whichever one needs it at the moment. Then again I might have it completely wrong...
Sometimes onboard devices can be a major pain when you try to disable them. No matter what you do, the machine still wants to use the one on the board. AGP also sometimes has a problem with using a PCI video card instead. You're actually better off with the AGP, since it's twice as fast. That goes back to another problem with onboard components. In some cases if you want a better one, you can't upgrade it without buying another motherboard.
Check the motherboard manual, you might have to set a jumper on the board to physically disable the onboard video, in addition to disabling it in BIOS.
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11-20-2000, 02:07 PM
I've had similar problems with my graphics card... Have you tried running it with the hardware acceleration turned off? it's not a solution, but if it works it narrows the range of problems down a bit. Have you checked that PCI steering (which seems to be operating here) is configured correctly? Just a thought.
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11-27-2000, 05:41 AM
You may also want to check and see if your cmos has a setting for wich where it looks for the video first. Since your agp is on board it may not have it (of course I could be confused all together) but I know mine has a setting to check pci or agp first. Dont know if it would help or not.
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