Power Management Events
There are 12 power events (such as standby, suspend and resume requests, and low battery notifications), plus OEM-defined events, that can be sent from the APM BIOS to the operating system. The APM driver regularly polls for event change notifications.
Power Management Events:
Name | Code | Comment |
---|---|---|
System Standby Request Notification | 0x0001 | |
System Suspend Request Notification | 0x0002 | |
Normal Resume System Notification | 0x0003 | |
Critical Resume System Notification | 0x0004 | |
Battery Low Notification | 0x0005 | |
Power Status Change Notification | 0x0006 | |
Update Time Notification | 0x0007 | |
Critical System Suspend Notification | 0x0008 | |
User System Standby Request Notification | 0x0009 | |
User System Suspend Request Notification | 0x000A | |
System Standby Resume Notification | 0x000B | |
Capabilities Change Notification | 0x000C | Due to setup or device insertion/removal |
Power management functions:
Name | Code | Comment |
---|---|---|
APM Installation Check | 0x00 | |
APM Real Mode Interface Connect | 0x01 | |
APM Protected Mode 16-bit Interface Connect | 0x02 | Avoids real or virtual86 mode. |
APM Protected Mode 32-bit Interface Connect | 0x03 | Avoids real or virtual86 mode. |
APM Interface Disconnect | 0x04 | |
CPU Idle | 0x05 | Requests system suspend. 0) Clock halted until timer tick interrupt. 1) Slow clock |
CPU Busy | 0x06 | Driver tells system APM to restore clock speed of the CPU. |
Set Power State | 0x07 | Set system or device into Suspend/Standby/Off state. |
Enable/Disable Power Management | 0x08 | |
Restore APM BIOS Power-On Defaults | 0x09 | |
Get Power Status | 0x0A | Supports AC status "On backup power". And battery status. |
Get PM Event | 0x0B | Checks for APM events. Shall be called once per second. |
Get Power State | 0x0C | |
Enable/Disable Device Power Management | 0x0D | |
APM Driver Version | 0x0E | |
Engage/Disengage Power Management | 0x0F | APM management for a specific device. |
Get Capabilities | 0x10 | |
Get/Set/Disable Resume Timer | 0x11 | |
Enable/Disable Resume on Ring Indicator | 0x12 | |
Enable/Disable Timer Based Requests | 0x13 | |
OEM APM Installation Check | 0x80 | Tells if APM BIOS supports OEM hardware dependent functions. |
OEM APM Function | 0x80 | Access to OEM specific functions. |
Read more about this topic: Advanced Power Management
Famous quotes containing the words power, management and/or events:
“Depression moods lead, almost invariably, to accidents. But, when they occur, our mood changes again, since the accident shows we can draw the world in our wake, and that we still retain some degree of power even when our spirits are low. A series of accidents creates a positively light-hearted state, out of consideration for this strange power.”
—Jean Baudrillard (b. 1929)
“The Management Area of Cherokee
National Forest, interested in fish,
Has mapped Tellico and Bald Rivers
And North River, with the tributaries
Brookshire Branch and Sugar Cove Creed:
A fishy map for facile fishery....”
—Allen Tate (18991979)
“Just as a mirror may be used to reflect images, so ancient events may be used to understand the present.”
—Chinese proverb.