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kIOReturnRLDError
Do not expand an undocumented acronym
kIOReturnRLDError is defined by Apple’s public IOKit header as an “rld failure.” The public header and the accompanying legacy reference retain that wording without defining an RLD subsystem, a device family, or a standard remediation. The value is real, but the short label is not enough to infer a particular hardware or protocol fault.
This makes the producing component essential. A driver can propagate the common status after an implementation-specific failure, so a meaningful diagnosis comes from the API, driver family, active device state, and adjacent logs. Treat any claimed expansion of “RLD” that is not documented by the producer as speculation.
What to preserve
- Record the raw value, IOKit service or driver family, operation, and operating-system build.
- Keep lower-level driver messages and any preceding status instead of replacing them with the generic label.
- Compare the failure with a known-good device or mode only after confirming that both use the same interface path.
- Escalate with a minimal reproducer when the producer offers no more specific diagnostic information.
References
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