Dual Boot Question Regarding IRQ Conflicts

Hewlett-packard Elitebook 6930p notebook...
July 25, 2009 at 11:06:10
Specs: Windows XP
I currently have a problem where my USB soundcard is sharing resources wih my wireless network card and my video card. This causes stuttering while watching videos and browsing online. If I make a new partition and set up another XP installation will the IRQ assignments be independent of the original XP installation?

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July 25, 2009 at 11:30:14
No, the IRQ assignments are made by the BIOS on modern systems. You can alter the assignments in two ways. First, if some of the devices are add in cards you can move them to different slots.

In the case of Laptops you only have the option of BIOS assignment. I don't know how much flexibility your will have with USB stuff.

Why are you using an external sound card? Today, most computers have pretty good integrated sound. I didn't pull up specs on your unit but many laptops have HD sound.

Did you downgrade from Vista by chance?

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July 25, 2009 at 12:53:14
I use an external USB soundcard for DAW recording. The integrated souncard has no problems. Many of the devices, including the video card, USB controllers, and wireless are on virtual IRQs even though there are so many physical IRQs open. I was going to try to disable all devices I am not using in BIOS, than install the second installation of XP and seeing if some of those devices, USB controller especially, are assigned to a physical IRQ so I get no more audio stuttering.

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July 25, 2009 at 17:11:53
If that is all you wish to do you MIGHT be able to setup a profile that disables some hardware. Not sure if that will help or not.

One thing that may help is to move the USB sound to a different USB port. Most times each USB controller serves TWO USB ports. So if you have four or more ports some of them will be using a different IRQ.

You may also have an option in your BIOS to Reset Data Configuration. Enable for ONE boot cycle with ALL hardware connected. That option allows reassignment of IRQs. If there is an option for legacy USB devices in the BIOS then enable that too.

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