DPC—Deferred Procedure Call. A mechanism for drivers to complete work at a lower IRQL after a high-priority interrupt. If a DPC took too long (more than one second, in practice), the kernel's watchdog timer would trigger a BSOD.
Now, eighteen months into her tenure, Maya was facing the most critical deadline of her career. Acme Systems had promised a major PC OEM that the graphics accelerator would ship with their new workstation line. The launch was in six weeks. The driver still had intermittent DPC watchdog timeouts under heavy load. windows wdk
One line of INF syntax fixed the test:
Access denied? But the driver had full access to the hardware. Maya spent six hours debugging. The problem turned out to be in the INF file: she had forgotten to mark the device as "wake-capable" in the power management settings. Windows, during a hot reset, expected the device to support certain power states. Her driver did support them, but the INF didn't declare it. DPC—Deferred Procedure Call
At hour 47, the HLK reported: "All tests passed. 3,152 tests run. 3,152 passed. 0 failed. 0 warnings." Now, eighteen months into her tenure, Maya was