IRQ conflict

goteeman · Post by **goteeman** » Thu Oct 03, 2002 7:47 pm

My motherboard's onboard usb irq is comes up as the same for the agp slot and is cause a conflicting issue. here is the link to the board i have.

http://www.msi.com.tw/program/produ...-6330%20Ver1.0C

please help me. have disabled the usb via the bios and that works, but i need the usb.

Jim Z · Post by **Jim Z** » Thu Oct 03, 2002 8:47 pm

what issue is it causing? What OS are you using?

goteeman · Post by **goteeman** » Thu Oct 03, 2002 9:06 pm

winxp...................think it causeing my system to shut down with out notice

blade · Post by **blade** » Fri Oct 04, 2002 7:03 pm

You are sure that is causing the problem, because when you have usb disabled it does not reboot?

Also does it say its causing a conflict in device manager?

Post by **FlyingPenguin** » Fri Oct 04, 2002 8:58 pm

Is it sharing an IRQ according to device manager or BIOS? I believe XP (like 2K) tries to share all of the PCI & AGP devices on the same IRQ.

Try booting with a blank floppy in the drive to force the BIOS POST results to stay up long enough to press the PAUSE key and freeze it. Most mobos list the IRQs being used at the bottom of this screen.

I would be VERY suprised if BIOS is assigning the AGP slot and USB the same IRQ - that's practically unheard of. Probably BIOS is assigning seperate ones and then XP is re-assigning them.

I suspect that in actuality the problem us your USB sharing an IRQ channel with another card other than the video (I'm willing to bet the BIOS POST display shows this). If you can figure out which card it is, move it to another slot.

Failing that, try pulling ALL your cards except the video card and see if the problem goes away (make a note of which slot each card was in). If so, then install your cards ONE BY ONE back in their original slots. If the problem recurs, move that card to a different slot.

Hope this helps...

Jim Z · Post by **Jim Z** » Fri Oct 04, 2002 11:13 pm

Is it sharing an IRQ according to device manager or BIOS? I believe XP (like 2K) tries to share all of the PCI & AGP devices on the same IRQ.

yeah, that's the "safe" way to do it on chipsets with no APIC. Which is the case with the KT133.

As far as the K7TPro 2A goes, MSI built a LOT of these boards that seemed to die prematurely. Usually the symptoms would be random reboots or problems powering up.

Also, is it just turning itself off, or rebooting? If it's rebooting, it might actually be because XP will reboot if it blue-screens, and sometimes you don't get to see the blue screen.

Post by **FlyingPenguin** » Fri Oct 04, 2002 11:24 pm

Also, is it just turning itself off, or rebooting? If it's rebooting, it might actually be because XP will reboot if it blue-screens, and sometimes you don't get to see the blue screen.

Good point. Right-click My Computer, Properties, Advanced, Startup & Recovery, and uncheck "Automatically Reboot"