Specifications

204 AMD Geode™ GeodeROM Functional Specification
Video BIOS Support
32087C
13.2.12 Function 10h: VBE Display Power Management Signaling (DPMS)
Controls the power state of the attached display device or monitor.
The VESA committee defined a method of signalling a monitor to shutdown or to go into standby mode. The sync sig-
nals are used in the following manner:
H Sync V SyncResult
Pulses PulsesMonitor is Active
None PulsesMonitor is in “Standby” mode
Pulses NoneMonitor is in “Suspend” mode
None NoneMonitor is in “Shutdown” mode
13.2.12.1 Subfunction 00h: Version Number/Supported Power State
Passed:
Returns:
13.2.12.2 Subfunction 01h: Requested Power State
Passed:
Returns:
Parameter Description
AX 4F10h
BL 00h
ES:DI Null pointer
DS Seg0
Parameter Description
AX VBE return status
BL VBE/PM version number:
Bits[7:4] = Major version number
Bits[3:0] = Minor version number (0)
BH States supported:
Bit 0 = Standby
Bit 1 = Suspend
Bit 2 = Off
Bit 3 = Reduced On
Bits[7:4] = Reserved
Parameter Description
AX 4F10h
BL 01h
BH Requested power state:
0 = On
1 = Standby
2 = Suspend
4 = Off
8 = Reduced On
ES:DI Null pointer
DS Seg0
Parameter Description
AX VBE return status