A brief discussion on power management and application (Part 2)

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A brief discussion on power management and application (Part 2) [Copy link]

The following is a brief introduction to the main settings related to power management, taking AWARD BIOS as an example. Entering the POWER MANAGEMENT SET UP menu generally has the following options: "Power Mangement" means: power management function, generally the default value is set to ENABLED/allowed to use; "PM Conrtool by APM" means: whether to hand over power management to the operating system, generally the default value is Yes, please note that the default value of some old motherboards is NO. If your computer operating system does not support "APMS", it cannot be set to Yes. "Video off Method" means: the method of turning off the display, and there are many options, including "DPMS", which is the abbreviation of the display power management system. It means that the display power management is handed over to the operating system that complies with the "DPMS" management specification. The commonly used mainstream operating systems now comply with this specification. This item is the default option, but it must be supported by a display and display card that complies with the "DPMS" management specification. You don't have to worry about this. Basically, current display cards support it. Other options are: V/H SYNC＋Blank screen/ Turn off the synchronization signal and brightness. This option is recommended when the device does not support the "DPMS" specification. It has much stronger power saving ability than the latter option; Blank screen/black screen only turns off the brightness without cutting off the synchronization signal. Its function is equivalent to turning off the brightness completely manually. The power saving ability is very limited and is not recommended. HDD Powr down means setting the time when the hard disk stops rotating. Generally, after the power management function is handed over to the operating system (PM Control by APM is set to Yes), the default value of this setting is Disable, which means it is forbidden to use. The user sets the specific usage of this function in the operating system according to his own needs. If your motherboard cannot turn off the hard disk after it is set to Disable, you can set it to Enabled again to try (some other options are similar to this item). If the hard disk still cannot be turned off, then there is a problem with the BIOS and you need to upgrade your BIOS to solve the problem. VGA Active Monitor means setting the display brightness activation. As mentioned earlier, this function is mainly used to select whether to activate the display when the computer needs to be remotely woken up or started after the computer is connected to the Internet. Its purpose is to keep the display in sleep mode when it is necessary to remotely wake up or start the computer and access the host without using the display, so as to achieve the purpose of maximizing energy saving and protecting the display device. This option is particularly suitable for on-duty computers or long-term servers that need to monitor various unattended devices that need to be remotely accessed or remotely started in industry. Soft-off by PWR-BTTN means to set the power off mode of the computer. The options are Instant-off/meaning to turn off the power immediately after pressing the power switch; Delay-4Secs/meaning to delay 4 seconds after pressing the power switch before turning off the power. If the delay time is less than 4 seconds, the computer will enter the sleep state. Power LED In Suspend means to set the display of the chassis power indicator when the system is in the suspended state. Generally, it can be set to Blanking/blinking, On/on, Off/off, and can be set according to your preferences. Resume By Alarm means to set the scheduled startup time, and Modem Ring resume means whether to use the network or MODEM to realize the remote wake-up or startup function. If you do not need to use the MODEM wake-up or remote startup function, it is best to turn off this function in the power management settings of the BIOS. If this function is turned on for many motherboards, it is easy to make the power management settings in the operating system invalid, making the computer unable to enter the sleep state. The main reason is that the external electromagnetic radiation interference makes the motherboard mistakenly think that it is the wake-up or startup signal of the MODEM and start the computer.

　　ACPI management mode:

　　ACPI is a more advanced power management mode than APM. Using ACPI mode can save more power. What does that mean? The temperature of those CPUs that we overclocked will be very low in Suspense mode, about 4-5 degrees lower than using APM mode. Of course, ACPI, like other power volume management methods, must have software and hardware support. WINDOWS 98 and its subsequent products and WINDOWS2000 all give full support to ACPI. As for hardware, it is mainly your motherboard, graphics card and network card that support ACPI. There should be no problem with the hardware you bought recently. You can refer to the manual of your hardware for specific situations. Well, after talking so much, how can I implement ACPI function on my computer?

　　We will use WINDOWS 98 to illustrate. If you haven't installed WINDOWS 98 yet, it's very simple. You just need to use SETUP /PJ during the installation. If you have already installed WINDOWS 98, go to the device manager, in the system devices, there is an item called Advanced Power Management. Double-click it, select Upgrade Driver, and show all devices. You should be able to see an item called Advance Configuration And Power Interface (ACPI). Select it and press Enter. The system will prompt you to restart. After the restart, WIN98 will prompt that new hardware has been found. Press Enter all the way.

　　Since ACPI is a newer power management mode, you may encounter some problems during use. The most common problems are as follows:

　　1. The computer cannot wake up from Suspense mode: This is mainly because the hardware does not support ACPI well. Check the manual to see if your hardware fully supports ACPI. You can also try to disable the motherboard's Power Manger function in the Bios to let Win98 take over power management completely. Some people also reported that this situation would occur when the USWC (Uncacheable speculative write combining) mode of the graphics card was set in the Bios. There would be no problem if it was changed back to the UC (Uncacheable) mode.

　　2. Some people can Suspense to Disk, but some can't: Suspense to Disk can only be implemented on FAT16. If you use FAT32, of course it won't work. However, some motherboards can implement Suspense to Disk even on FAT32 through special design, but there are not many such motherboards, and it seems that only Gigabyte can do it.

　　Conclusion

　　In actual operation, various problems will arise. As long as we debug from both APM and ACPI modes and carefully accumulate experience, we will truly achieve environmentally friendly and energy-saving power management.

mdreamj

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zbz0529

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