Device Power Management - Toshiba Satellite 1700 Series Maintenance Manual

1.22 Power Management
1.22.4

Device Power Management

Under ACPI mode, the device specific power management supported by this notebook
includes the CPU throttling, monitor power management and the hard disk.
CPU power management
ACPI mode
The operating system detects when the system is idle and places the CPU in one of
the 3 CPU low power states (C1, C2 or C3) depending on how much latency it
believes the system can afford.
The C1 State is simply the CPU halt instruction. The C2 State is the CPU stop Grant
State. The C3 State is the CPU stop Clock State. The CPU stays in this state until an
interrupt occurs.
Hard Disk
The hard disk will be spun down after a period of no activity based on the settings of
the OS.
Display Device
The monitor can be turned off after a period of no activity based on the settings of the
OS.
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1 Hardware Overview
Satellite 1700 Series Maintenance Manual