Advanced Configuration and Power Interface Specification

Device Configuration
Example ASL:
Name (_SUB, "MSFT3000")// Vendor-defined subsystem
6.1.10 _STR (String)
The _STR object evaluates to a Unicode string that describes the device. It may be used by an OS to
provide information to an end user. This information is particularly valuable when no other
information is available.
Arguments:
None
Return Value:
A Buffer containing a Unicode string that describes the device
Example ASL:
Device (XYZ) {
Name (_ADR, 0x00020001)
Name (_STR, Unicode ("ACME super DVD controller"))
}
Then, when all else fails, an OS can use the info included in the _STR object to describe the
hardware to the user.
6.1.11 _SUN (Slot User Number)
_SUN is an object that evaluates to the slot-unique ID number for a slot. _SUN is used by OSPM UI
to identify slots for the user. For example, this can be used for battery slots, PCI slots, PCMCIA
slots, or swappable bay slots to inform the user of what devices are in each slot. _SUN evaluates to
an integer that is the number to be used in the user interface.
Arguments:
None
Return Value:
An Integer containing the slot’s unique ID
The _SUN value is required to be unique among the slots of the same type. It is also recommended
that this number match the slot number printed on the physical slot whenever possible.
6.1.12 _UID (Unique ID)
This object provides OSPM with a logical device ID that does not change across reboots. This object
is optional, but is required when the device has no other way to report a persistent unique device ID.
The _UID must be unique across all devices with either a common _HID or _CID. This is because a
device needs to be uniquely identified to the OSPM, which may match on either a _HID or a _CID to
identify the device. The uniqueness match must be true regardless of whether the OSPM uses the
_HID or the _CID. OSPM typically uses the unique device ID to ensure that the device-specific
information, such as network protocol binding information, is remembered for the device even if its
relative location changes. For most integrated devices, this object contains a unique identifier.
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