Acer Hotkey Functions (Type 170)
Source: the Acer WMI driver of Linux, acer-wmi.c, dmidecode, dmioem.c, and the dumps of the data corpus.
Tells the functions of the hotkeys of a laptop, which the Acer WMI driver of Linux reads. Some laptops of other brands, e.g. Fujitsu-Siemens, Medion, Lenovo and eMachines, are said to carry it too.
The Acer WMI driver reads the structure up to the number of the key of the
communication function, at 0x0E. In the data corpus, that byte begins a list
of 4-byte hotkeys, which runs to the end of the structure: the number of a key,
a byte of 1 or 2, the same for all the hotkeys of a structure, and the
function of the key, as bits of the bitmap of its button group: the key of the
communication function has all the bits of the communication bitmap, e.g. those
of WiFi and Bluetooth. The high bits of the key number tell the group: 0x0_
communication, 0x4_ media, 0x6_ display and 0x8_ others, and the functions
of the keys of the media and display groups add up to their bitmaps.
Structures of 0x0F bytes end with the number of the key of the communication
function, and hold no hotkeys.
| Offset | Version | Name | Length | Value | Description |
|---|---|---|---|---|---|
|
2.0+ |
Type |
|
|
Acer Hotkey Functions indicator |
|
2.0+ |
Length |
|
Varies |
Length of the structure |
|
2.0+ |
Handle |
|
Varies |
|
|
2.0+ |
Communication Button Functions |
|
|
Bit 0: WiFi, bit 6: 3G, bit 7: WiMAX, bit 11: Bluetooth, bit 14: radio button |
|
2.0+ |
Application Button Functions |
|
|
|
|
2.0+ |
Media Button Functions |
|
|
|
|
2.0+ |
Display Button Functions |
|
|
|
|
2.0+ |
Other Button Functions |
|
|
|
|
2.0+ |
Hotkeys |
4 BYTEs each |
Varies |
Hotkeys, see below; the key of the first one is the communication function key number |
| Offset | Name | Length | Description |
|---|---|---|---|
|
Key |
|
Number of the key, whose high bits tell the button group |
|
Kind |
|
Meaning not established, |
|
Function |
|
Function of the key, as bits of the bitmap of its button group |