Benign Message: pciehp: Both _OSC and OSHP methods do not exist

Warning Message: pciehp: Both _OSC and OSHP methods do not exist is benign.

Problem

This message is issued when the pciehp driver is loaded. _OSC and OSHP are ACPI methods related to hot-plugging that are not used by the Sun Blade X8400, X8420, and X8440 Server Modules. The system message that refers to this is benign.

The native PCIe hot-plug subsystem assumes the existence of the _OSC and OSHP hot-plug ACPI methods. Upon not finding these methods, it prints this message:

pciehp: Both _OSC and OSHP methods do not exist

Impacted OS: RHEL AS 4-U3; RHEL AS 4-U4; SLES9-SP3

Impacted Hardware: All server modules (X8400, X8420, X8440)

Workaround

The Sun Blade X8400, X8420, and X8440 Server Modules do not use the pciehp.ko module, but rather the ACPI hot-plug subsystem (acpiphp.ko). Consequently, the above message is benign.