Sage-Tips

Can 2 devices share the same IRQ?

When two or more devices use the same interrupt line (and the same IRQ number) it’s either “Interrupt Sharing” or an “Interrupt Conflict”. The PCI bus allows all PCI devices to share interrupts with each other so this is called “sharing”.

How do you fix IRQ conflicts?

If you do have a conflict and need to change an IRQ setting:

1. Right click on the device in the list (see above), and then select properties.
2. Click the Resources tab.
3. Remove the tick from the Use automatic settings option.
4. Select a non-conflicting configuration from the pull down box.
5. Click OK.

How do I change the IRQ on my device?

How to Change IRQ Settings

1. Open Device Manager.
2. Double-click or double-tap a device to open its Properties window.
3. In the Resources tab, deselect the Use automatic settings option.
4. Use the Settings based on drop down menu to select the hardware configuration that should be changed.

Why do different devices generally not have the same interrupt?

Since multiple signals to the computer on the same interrupt line might not be understood by the computer, a unique value must be specified for each device and its path to the computer.

How do I know if I have conflicting drivers?

How to Detect Driver Conflict

1. Click “Start”.
2. Click “Computer”.
3. Click on the gray “System Properties” button, followed immediately by the blue “Device Manager” hyperlink.
4. Right click on the entry in the Windows Device Manager for the hardware that you fear may have a driver conflict.
5. Click “Scan for Hardware Changes”.

What is an IRQ conflict?

An IRQ conflict happens when two devices attempt to use the same IRQ number, and the operating system or motherboard has no mechanism for accommodating this. These conflicts were common in older versions of Windows, but occur only rarely in modern versions of the operating system.

How do I view IRQ conflicts in Windows 10?

How to Detect an IRQ Conflict

1. Click “Start,” then click “Control Panel” to open the Control Panel window.
2. Click the “Hardware” tab, then click the “Device Manager” button.
3. Click the “View” menu at the top of the Device Manager window.
4. Click the expansion box next to the “Interrupt request (IRQ)” icon.

How do I stop sharing IRQ?

Avoid IRQ sharing by using different PCI or PCIe slot You can avoid IRQ sharing between devices and fix a IRQ conflict if you change the PCI or PCIe slot for the devices you want to get assigned with a different IRQ.