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Changing Settings for an Installed Device
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Under most circumstances, you cannot use Device Manager to change resource settings for a specific PCI or USB device. Resources are allocated automatically by the operating system at startup, and the controls to change resource settings are unavailable. Resource conflicts are most common with legacy devices that are not fully compatible with Plug and Play. In the rare event that you experience a resource conflict, you might be able to adjust resource settings manually from the Resources tab: Clear the Use Automatic Settings check box and cycle through different settings to see if any of the alternate configurations resolve the conflict. If you suspect that a hardware problem is caused by a resource conflict, you can access an overview of resource usage by opening the System Information utility (Msinfo32.exe), which is found on the All Programs menu under Accessories, System Tools. Open Hardware Resources in the console pane and pay special attention to the Conflicts/Sharing entry, shown in Figure 5-14, and the Forced Hardware item. Don t be alarmed if you see a number of devices sharing a single IRQ; that s perfectly normal.
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Figure 5-14 All the devices shown in this example are sharing resources properly. If two unrelated devices try to share a resource other than an IRQ, you may need to adjust device settings manually. For more information about the System Information utility, see Digging Deeper with Dedicated System Information Tools, in Appendix D.
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For legacy devices whose resources can t be assigned by Windows, you ll need to adjust jumpers on the card or device, or use a software-based setup/configuration utility to change resource settings for that device.
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If two devices are in conflict for a system resource, try any of these strategies to resolve the problem:
1. With PCI devices, try swapping cards, two at a time, between PCI slots. On
some motherboards, IRQs and other resources are assigned on a per-slot basis, and moving a card can free up the proper resources. Check the motherboard documentation to see which IRQs are assigned to each slot and experiment until you find an arrangement that works.
2. If the conflict is caused by a legacy (ISA) device, replace it with a Plug and Play
compatible PCI device.
3. Use jumpers or a software utility to change settings on a legacy device so that
it reserves a different set of resources. You will need documentation from the manufacturer to accomplish this goal. If you have problems with PCI devices, the device itself might not be to blame. When drivers and ACPI BIOS code interact improperly, conflicts can result. Check for an updated hardware driver (especially if the current driver is unsigned), and look for a BIOS update as well.
Managing Installed Drivers
If you re having a hardware problem that you suspect is caused by a device driver, your first stop should be Device Manager. Open the properties dialog box for the device, and use the following buttons on the Driver tab to perform maintenance tasks:
l l
Update Driver
This choice starts the Hardware Update Wizard.
Roll Back Driver This option uninstalls the most recently updated driver and rolls back your system configuration to the previously installed driver. Unlike System Restore, this option affects only the selected device. If you have never updated the selected driver, this option is unavailable. Uninstall This button completely removes driver files and registry settings for the selected device. This option is available from Safe Mode if you need to remove a driver that is causing blue-screen (Stop) errors. You can also use this capability to remove a driver that you suspect was incorrectly installed and then reinstall the original driver or install an updated driver.
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Managing Installed Drivers
INSIDE OUT
Create a safety net before tinkering with drivers
When you install a new, unsigned hardware driver, Windows automatically attempts to create a new System Restore checkpoint. That doesn t mean it will be successful, especially if a problem with your System Restore settings has caused this utility to suspend operations temporarily. To make certain that you can roll back your changes if necessary, set a new System Restore checkpoint manually before making any kind of hardware configuration change. (For more details, see Rolling Back to a Stable State with System Restore, in 23.)
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