DRIVER_IRQL_NOT_LESS_OR_EQUAL 0x000000d1 is a critical blue screen error caused by driver issues, as you could have guessed from the error code string. Driver issues causing the blue screen with the “driver irql not less or equal” include incompatibilities with hardware or currently installed software, driver conflicts, outdated or incorrectly written drivers. The error needs to be resolves ASAP, otherwise system disability, hardware damage or even data loss.

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STOP 0x000000d1 DRIVER_IRQL_NOT_LESS_OR_EQUAL: Explanation

A BSOD with bsod “driver irql not less or equal” message points to an attempt of a system to access pageable memory using the process with IRQL that was too high. As a rule, this is caused by drivers using improper addresses. What does that mean? Interrupt requests are used by computers to handle hardware operations. Interrupt requests are send to the processor by keyboards, video cards or sound cards and other devices as a command to interrupt its current process and give a piece of hardware or device the “priority” to run its process. The higher the interrupt request of a device the longer it has to wait in queue before its request processed. The processes of devices with IRQ 1 are prioritized over those with IRQ 10. DRIVER_IRQL_NOT_LESS_OR_EQUAL 0x000000d1 occurs when device drivers share the same IRQ causing a conflict with DRIVER_IRQL_NOT_LESS_OR_EQUAL and STOP message. In certain cases the driver that caused the issue may be listed in the error text on the blue screen. Pay attention to the file with the *.sys extension that contains driver data.

When you search for the information about an error code, enter the bugcheck name exactly the way it appear on the blue screen, do not omit the underscore (_) signs between the words in the error code. Specifiaclly, for DRIVER_IRQL_NOT_LESS_OR_EQUAL 0x000000d1 it is recommenced that you enter the search string like this:


instead of

driver irql not less or equal 0x000000d1

You’ll get more search engine results for the first query and they will most likely be the technical explanation. The second query will most likely be a users request for help. This refers not just to DRIVER_IRQL_NOT_LESS_OR_EQUAL 0X000000D1 but to any blue screen error code.