You can find out the driver which causes the excessive DPC latencies by disabling individual devices using Windows Device Manager. To open Device Manager, choose Properties from the context menu of the My Computer icon on your desktop and click the Device Manager button on the Hardware tab.
In Device Manager disable individual devices, one at a time. To disable a device, right-click on the corresponding item (e.g. on the Ethernet adapter) and choose Disable from the context menu. Windows marks a disabled device with a read cross as shown in the figure below. To enable a device again, choose Enable from the context menu.
After you disabled a single device, carefully watch DPC Latency Checker. When excessive latency values disappear you found the responsible device driver. If there are still exceptional large DPC latencies try the next device.
In many cases DPC latency problems are caused by specific types of devices. So you should try the device types listed below first.
- Network adapters for Ethernet and Wireless LAN (W-LAN)
- Internal modems
- Internal sound devices (on-board sound systems)
- Any PCI or PCI Express add-on card, any PCCard or ExpressCard, e.g. TV tuner cards, ISDN or DSL adapters, modems, etc.
Warning: Don't disable devices that are essential for your computer to function!
You should not disable:
- any device listed in Device Manager under System devices or Computer,
- the hard disk that contains the system partition,
- the IDE/ATAPI or SATA controller this hard disk is connected to,
- the system keyboard,
- the mouse, track point or touch pad device,
- the USB controller external keyboard and/or mouse devices are connected to,
- the display controller listed under Display adapters.