The Vga Bios should support DPMS Desktop Power Management System for the standby and hibernation mod

HARD DISK STANDBY MODE

The hard disk enters standby mode when there are no disk read/write operations within the period of time determined by the computer's HPM unit. In this state, the power supplied to the hard disk is reduced to a minimum. The hard disk returns to normal once the computer accesses it.

Table 1-35 Hard Disk Standby Mode Conditions and Descriptions

Condition

Description

The condition to enter HDD Standby Mode

Display Standby HPM timer times-out or LCD cover is closed.

The condition of HDD Standby Mode

All the system components are on except HDD spindle motor

The condition back to On Mode

Any access to HDD

BATTERY LOW

BATTERY LOW

When the battery capacity is low and no adapter is plugged in, the system will generate the following battery low warning:

  • Flash power LED with 1 Hz.
  • Issue 4 short beeps per minute (if enabled in setup).
  • If the AC adapter does not plug in within 3 minutes and the "Standby/Hibernation upon Battery-low" in BIOS SETUP is enabled, the system will enter Standby/0-Volt Hibernation Mode. The battery low warning will stop as soon as the AC adapter is plugged into the system.

THE AUTODIM PROCESS OF THE LCD BRIGHTNESS

The notebook has a unique "automatic dim" power saving feature. When the notebook is using AC power and you disconnect the AC adapter from the notebook, the system "decides" whether or not to automatically dim the LCD backlight to save power.

If the LCD backlight is too bright, the system automatically adjusts it to a manageable level; otherwise, the level stays the same. If you want a brighter picture, you can then adjust the brightness and contrast level using hotkeys (Fn-F2).

If you reconnect AC power to the system, the system automatically adjusts the LCD backlight to its original level — the brightness and contrast level before disconnecting the AC adapter. If you adjusted the brightness and contrast level after disconnecting AC power, the level stays the same after you reconnect the AC adapter.

There are two reasons for the notebook to have the LCD AutoDim feature. The first is to save the power during the notebook is operating under the DC mode. The second is to save the "favorite" brightness parameter set by the user.

The following processes are the basic methods used to implement the LCD brightness AutoDim.

  1. If the original brightness is over 75% and the AC power is on-line, the BIOS will change the brightness to 75% after the AC power is off-line.
  2. If the original brightness is below 75%, the brightness maintains the same level even if the AC power is off-line.
  3. If the brightness is already changed by the hotkey under DC power, it will not be changed after the AC power is plugged in.
  4. If the brightness is not changed by the hotkey under DC power, the brightness will be changed back to the old setting — the previous brightness parameter under AC power.
  5. If the previous brightness parameter does not exist, the brightness will not be changed in process 4.
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