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ERROR_BIOS_FAILED_TO_CONNECT_INTERRUPT
What this result means
ERROR_BIOS_FAILED_TO_CONNECT_INTERRUPT is a Windows system result. This is a platform-initialization problem involving firmware tables, interrupt routing, chipset configuration, or device resources. The operating system could not establish the interrupt path needed for the device to start reliably.
Likely causes
- outdated or defective BIOS/UEFI firmware supplied incorrect routing data
- a device, bridge, or chipset has conflicting resource assignments
- firmware settings changed after a hardware or expansion-card update
- virtual-machine firmware or passthrough configuration does not expose interrupts correctly
Where this code is usually encountered
- Firmware publishes ACPI or PCI routing information that Windows cannot use for a device.
- A new expansion card changes bridge topology or exposes a resource conflict.
- Virtual-machine firmware or device passthrough does not provide a working interrupt route.
Useful evidence
- BIOS/UEFI and chipset versions
- the affected device instance path, resources, and Device Manager problem code
- ACPI, Kernel-PnP, HAL, and WHEA events
- hardware changes, firmware setting changes, and passthrough configuration
Troubleshooting steps
- Identify the exact device and upstream bridge rather than updating every driver indiscriminately.
- Load vendor defaults and reproduce with unnecessary expansion devices removed.
- Compare the current firmware resource map with a known-working revision or machine of the same model.
- For virtual machines, test without passthrough and with the vendor-supported virtual hardware version.
Guidance for developers
Drivers cannot reliably repair incorrect platform routing. They should fail device start cleanly, report the resource set they received, and avoid polling fallbacks that hide a broken interrupt path.
Guidance for administrators
Apply only vendor-approved firmware and chipset packages, with a recovery plan. Repeated failures after firmware update warrant hardware-vendor analysis because forcing assignments can destabilize other devices.
How to interpret it correctly
An interrupt-route failure differs from a device that starts but never generates interrupts. The former is established during platform or PnP configuration; the latter may be a driver or hardware runtime fault.
Example failure pattern
The most informative comparison uses the same device with one variable changed at a time: firmware revision, slot, bridge, passthrough mode, or optional expansion hardware. If the route fails before the device driver receives usable resources, application-level logs will add little.
Retry and recovery policy
Repeated PnP restart attempts should be bounded. When firmware supplies the same unusable route, cycling the device cannot repair it and may create secondary start/stop noise that obscures the original platform event.
References
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