KD7 Why are all of the PCI IRQ set to 11 ?

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Win2000:
Creative Modem Blaster
Hauppauge WinTV Audio
Hauppauge WinTV Video
Realtek AC'97 Audio
Realtek Ethernet
3*Via USB Controller
VIA Ethernet

...all of them on IRQ 11.

Actually, with everything set to AUTO,
all of them were IRQ 11 except for WinTV Audio, which somehow went to IRQ
12.
Doesn't make any sense, does it? The WinTV audio and video are both on the same card, in one slot, so shouldn't they both have gotten the same IRQ?

Anyway, went into BIOS and set the PIRQ -> IRQ. 10, 7, 11, 12 to try and spread things out. The boot screen that lists the PCI IRQ indicated that I was somewhat successful, although the IRQ 7 became IRQ 3... at least both of the WinTV IRQ were the same...

...booted into Windows and checked Device Manager: all of the IRQ changed back to IRQ 11.

Uninstalled, reinstalled the modem driver. Device Manager says it's using IRQ 3. OK, fine, at least it's not IRQ 11. Rebooted. Checked Device
Manager:
it's now back to IRQ 11.

Doesn't seem to want to use anything other than IRQ 11 for the PCI cards. Guess it doesn't really matter; everything is working OK now...but shouldn't it be assigning the IRQ from the list of 4 in the BIOS? Windows over-rides the settings and changes them to IRQ 11??

hmm... just noticed there's no IRQ assigned to the Printer Port. And shouldn't there be an IRQ for the AGP video card? that hasn't shown up in the list for a long time...

What's going on here?
 
ACPI and IRQ sharing. it is normal in a PCI environment with ACPI enabled.
 
"TomG" wrote:

ACPI and IRQ sharing. it is normal in a PCI environment with ACPI
enabled.

Yeah, but should they ALL use the same IRQ, when there are several others available? IRQ 10 and 12 for instance aren't used at all... and isn't the point of that PIRQ->IRQ screen in the BIOS to specify the PCI IRQ?

I've heard that you shouldn't put anything in slot #1 since it shares an IRQ with the AGP. The way things look right now it's only using one IRQ for all of the slots. (and what happened to that AGP interrupt anyway...)
 
In article <w%fQa.45266$>,
says...
Win2000:
Creative Modem Blaster
Hauppauge WinTV Audio
Hauppauge WinTV Video
Realtek AC'97 Audio
Realtek Ethernet
3*Via USB Controller
VIA Ethernet

...all of them on IRQ 11.

Check out this page.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;252420

Doug
 
again, it is quite normal. to get devices to not use IRQ's in this fashion, you would need to disable ACPI, convert the OS from an ACPI type installation to an older style APM installation and then the PIRQ settings might be able to drive a device to a different IRQ.
 
"TomG" wrote:

again, it is quite normal. to get devices to not use IRQ's in this fashion, you would need to disable ACPI, convert the OS from an ACPI type installation to an older style APM installation and then the PIRQ settings might be able to drive a device to a different IRQ.

Turns out that's not the right answer. The IRQ's should not be shared.

I my case, I think the problem arose from the fact that in the last 6 months, I've gone through 3 motherboards, 3 video cards, 2 CPUs, 2 OS's...

The simple solution to the IRQ problem: 'fresh' install of the OS (install to a new directory). No changes to ACPI required.

The IRQ situation now looks like this:

IRQ Number Device
1 Standard 101/102-Key or Microsoft Natural PS/2 Keyboard 3 Communications Port (COM2) 4 Communications Port (COM1) 5 PCI Simple Communications Controller 6 Standard floppy disk controller 8 System CMOS/real time clock 9 Microsoft ACPI-Compliant System 12 Hauppauge Win/TV 878/9 VFW Audio Driver 13 Numeric data processor 14 Primary IDE Channel 15 Secondary IDE Channel 16 RADEON 9200 17 Realtek RTL8139(A)-based PCI Fast Ethernet Adapter 18 Hauppauge Win/TV 878/9 VFW Video Driver 21 VIA USB Universal Host Controller 21 VIA USB Universal Host Controller 21 VIA USB Universal Host Controller 22 Realtek AC'97 Audio for VIA (R) Audio Controller 23 VIA Rhine II Fast Ethernet Adapter

System is now very stable...
 
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