1 What: /sys/bus/acpi/devices/.../path
3 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
5 This attribute indicates the full path of ACPI namespace
6 object associated with the device object. For example,
8 This file is not present for device objects representing
9 fixed ACPI hardware features (like power and sleep
12 What: /sys/bus/acpi/devices/.../modalias
14 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
16 This attribute indicates the PNP IDs of the device object.
17 That is acpi:HHHHHHHH:[CCCCCCC:]. Where each HHHHHHHH or
18 CCCCCCCC contains device object's PNPID (_HID or _CID).
20 What: /sys/bus/acpi/devices/.../hid
22 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
24 This attribute indicates the hardware ID (_HID) of the
25 device object. For example, PNP0103.
26 This file is present for device objects having the _HID
29 What: /sys/bus/acpi/devices/.../description
31 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
33 This attribute contains the output of the device object's
34 _STR control method, if present.
36 What: /sys/bus/acpi/devices/.../adr
38 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
40 This attribute contains the output of the device object's
41 _ADR control method, which is present for ACPI device
42 objects representing devices having standard enumeration
43 algorithms, such as PCI.
45 What: /sys/bus/acpi/devices/.../uid
47 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
49 This attribute contains the output of the device object's
50 _UID control method, if present.
52 What: /sys/bus/acpi/devices/.../eject
54 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
56 Writing 1 to this attribute will trigger hot removal of
57 this device object. This file exists for every device
58 object that has _EJ0 method.
60 What: /sys/bus/acpi/devices/.../status
62 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
64 (RO) Returns the ACPI device status: enabled, disabled or
65 functioning or present, if the method _STA is present.
67 The return value is a decimal integer representing the device's
70 Bit [0] – Set if the device is present.
71 Bit [1] – Set if the device is enabled and decoding its
73 Bit [2] – Set if the device should be shown in the UI.
74 Bit [3] – Set if the device is functioning properly (cleared if
75 device failed its diagnostics).
76 Bit [4] – Set if the battery is present.
77 Bits [31:5] – Reserved (must be cleared)
79 If bit [0] is clear, then bit 1 must also be clear (a device
80 that is not present cannot be enabled).
82 Bit 0 can be clear (not present) with bit [3] set (device is
83 functional). This case is used to indicate a valid device for
84 which no device driver should be loaded.
86 More special cases are covered in the ACPI specification.
88 What: /sys/bus/acpi/devices/.../hrv
90 Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
92 (RO) Allows users to read the hardware version of non-PCI
93 hardware, if the _HRV control method is present. It is mostly
94 useful for non-PCI devices because lspci can list the hardware
95 version for PCI devices.