A brief discussion on power management and application

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A brief discussion on power management and application [Copy link]

The reason why the environmentally friendly and energy-saving personal computer (Green PC) is different from the general traditional computer is that it has a power management function, which can reduce the power consumption of the system when it is turned on and not in use, so as to achieve the purpose of saving energy. When the computer is in normal operation, it is in full-speed working mode, and the power management program will monitor the system display, serial and parallel ports, hard disk reading and writing, keyboard, mouse and other devices. The working status of the device is monitored one by one (these events are called Power Management Event power management monitoring events). If the above events are all in a paused state, the system will enter the power saving mode. When any monitoring event occurs, the system will immediately return to the full-speed working mode to provide the fastest service for the user. x5 T
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　　Therefore, Power Management was introduced into BIOS in the late 486 era and became one of its setting items. In the future, this function was built-in on the motherboard BIOS without exception. If this function is used correctly, it can indeed achieve the effect of saving energy, especially for computers that work continuously. When no one is operating, it can reduce power consumption, or when you are away for 1 to 2 hours, you can also put it into sleep mode to keep it in a low-power state. tpB-E
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　　used on PCs , one is APM management mode and the other is ACPI management mode. ${^4S (c)【Red Tea Forum】 -- Red Tea House Community ForumG%D=b5 APM management mode: Xn*YiE (c)【Red Tea Forum】 -- Red Tea House Community Forum0b;6]JEveryone 　　knows that environmental protection is a major trend in the world today. The development of computer technology, especially the large-scale use of laptops, requires us to control the energy consumption of computers more strictly. In this case, the realization of APM (Advanced Power Management ) function enables us to control the energy consumption of computers more easily. Now most computers meet the "APM" specification and have advanced energy management functions. + (c)【Red Tea Forum】 -- Red Tea House Community Forum uFp& 　　For the energy management function of current computers, it generally has two parts to realize power management . One part is directly realized by the BIOS on the computer motherboard, mainly for operating systems that do not have advanced energy management functions, such as D OS622. The other part is for operating systems that meet the "advanced energy management" specifications, such as the WIN9X series. The BIOS hands over the control of energy management to operating systems with advanced power management functions, allowing users to set them according to their actual needs in the operating system. The latter method is very intuitive and convenient to use, and the operation interface is very friendly, so people can learn it at a glance. Therefore, the latter method is called A PM advanced energy management. As for whether the power management function is controlled by the BIOS or the operating system, it depends on our settings in the BIOS. k (c)【Red Tea Forum】 -- Red Tea House Community Forum*^caXSometimes 　　, the following situation may occur: once the computer falls asleep, it cannot be awakened and has to be restarted... "In addition to paying attention to the settings in the operating system, we must also consider the BIOS: "Power Usage Scheme" selects "Always On", "Turn Off Monitor" and "Turn Off Hard Drive" select "Never". This is an incomplete approach, which actually abandons the power management function of the operating system, so that the computer system only enables the screen saver but cannot enter a full sleep state, thereby failing to save energy to the maximum extent and reduce equipment loss. Some people think that if the settings in the operating system do not work, then there is a problem with the hardware or the BIOS itself, which is too arbitrary. If the BIOS does not hand over the control to the operating system for its own control, then no matter how it is set in the operating system, it will be useless. At this time, if there are other improper settings in the BIOS, the above phenomenon may occur. The main reason for the incomplete understanding above is that the issue of BIOS master control is ignored. If PM Control by is not set in the BIOS, the BIOS will not be able to control the BIOS. If the APM option (whether to hand over energy management to the operating system) is set to YES, then no matter how it is set in the operating system, the advanced energy management function will not be implemented, because the BIOS does not hand over the control of energy management to the operating system at this time, but the BIOS itself implements the energy management function. If in this case the settings in the operating system do not work, it is inappropriate to simply judge that there is a problem with the motherboard or the BIOS itself. In most cases, the above problems are caused by problems with the BIOS settings, not problems with the hardware or the BIOS itself. It is estimated that on the one hand, the control of power management is not handed over to the operating system in the BIOS, so that the computer's advanced power management is controlled by the BIOS itself, and the user's settings in the operating system do not work. On the other hand, there are problems with some specific setting items of energy management, such as the use of the " power management user-defined function" However, when setting the monitor brightness activation, the monitor brightness activation was set to NO (this function was originally used for MODEM to remotely wake up the computer without waking up the monitor, in order to save energy and protect the monitor). In this way, the computer host is awakened and starts working, but there is no display because the monitor brightness cannot be activated. This makes people mistakenly think that the computer has crashed. In fact, the computer host has started working at this time, but there is no display, which makes people make wrong judgments. If you encounter this kind of soft failure, as long as you carefully check the various settings of BIOS, fully understand the requirements and uses of each setting, and try the matching combination of various options several times, you can completely eliminate it by yourself. tv( (c)【Red Tea Forum】 -- Red Tea House Community Forum 2,Cb 　　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, and the default value is generally set to ENABLED/allowed to use. "PM Conrtool by APM" means: whether to hand over power management to the operating system, and the default value is generally Yes,Please note that the default value of this item is NO for some old motherboards. If your computer operating system does not support "APMS", you cannot set it to Yes. "Video off Method" means: the method of turning off the display. There are many options, including "DPMS" which is the display









The abbreviation of power management system means that the power management of the display is handed over to the operating system that complies with the "DPMS" management specification. The mainstream operating systems commonly used now all comply with this specification. This option is the default option, but it must be supported by a display and display card that comply with the "DPMS" management specification. You don't have to worry about this. Most display cards now 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 manually turning off the brightness completely. 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 prohibited 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 setting it to Disable, you can set it to Enabled to try again (the situation of some other options is similar to this item). If the hard disk still cannot be turned off, then there is a problem with the BIOS. You need to upgrade your BIOS to solve the problem. VGA Active Monitor means setting the monitor brightness to activate. As mentioned above, this function is mainly used to select whether to activate the monitor when the computer needs to be remotely woken up or started after it is connected to the Internet. Its purpose is to keep the monitor in sleep mode when it is necessary to remotely wake up or start the computer and access the host without using the monitor, so as to achieve the purpose of maximizing energy conservation 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 setting the power off mode of the computer. The options are Instant-off/meaning that the power is turned off immediately after pressing the power switch; Delay-4Secs/meaning that the power is turned off after 4 seconds after pressing the power switch. If the delay time is less than 4 seconds, the computer goes into sleep mode. Power LED In Suspend means setting the display of the chassis power indicator when the system is in suspended state. It can generally be set to Blanking/flashing, On/lit, Off/off, and can be set according to your preferences. Resume By Alarm means to set the scheduled boot time, and Modem Ring resume means whether to use the network or MODEM to realize the remote wake-up or boot function. If you do not need to use the MODEM wake-up or remote boot function, it is best to turn off this function in the power management settings of the BIOS. If many motherboards turn on this function, it is easy to make the power management settings in the operating system invalid and the computer cannot enter the sleep state. The main reason is that the electromagnetic radiation interference from the outside makes the motherboard mistakenly think that it is the wake-up or boot signal of the MODEM and start the computer. ACPI management mode: \eRed Tea Forum】 -- Red Tea House Community Forum t: G8　　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 have overwhelmed will be very low in Suspense mode, which will be about 4-5 degrees lower than using APM mode. Of course, ACPI, like other power volume management methods, must be supported by software and hardware. WINDOWS 98 and its subsequent products and WINDOWS2000 all give full support to ACPI. As for the hardware, it is mainly your motherboard, graphics card and network card that need to support ACPI. There should be no problem with the hardware you bought recently. You can refer to the manual of your hardware for specific details. Well, after talking so much, how do I implement the ACPI function on my computer?