System Sleep States: S0, S1, S2, S3, S4 & S5
Fellow engineers, in this article I am going to discuss the system sleep states: S0, S1, S2, S3, S4 and S5 in detail. Do go through the article and let me know if you have any follow-up questions. I will be happy to answer them for you.
Understanding System Sleep States S0 — S5: A Comprehensive Overview
Computers are complex systems, designed with various operational states to optimize power consumption, enhance longevity and facilitate user convenience.
One such sophisticated feature is the concept of system sleep states, referred to as S-states in the ACPI (Advanced Configuration and Power Interface) specification.
These range from S0, a fully operational state, to S5, a system shutdown state. Here, we’ll delve into states S0 through S5, discuss their advantages, disadvantages, applications in system troubleshooting, and any relevant short forms.
System Sleep States: S0 — S5
S0: Working or Awake
The S0 state, also known as the «Working» or «Awake» state, is where the system is fully powered and operational. It is the state during which the computer is performing tasks and running applications.
The system can shift to a variety of power levels while in S0, dynamically adjusting based on the level of activity and the tasks being performed.
Pros
Full functionality and performance as all hardware and software components are active
Dynamic power management to balance power consumption and performance
Cons
Highest power consumption among all states
Continuous operation can lead to wear and tear of hardware components
The S0 state does have sub-states, often referred to as S0ix, or «Active Idle» states.
These were introduced with the ACPI 6.0 specification and allow for even more granular power management in modern systems.
The S0ix states, where ‘ix’ can range from 1 to n (like S0i1, S0i2, S0i3, and so forth), are intermediate power-saving states that exist within the operational S0 state.
They represent different levels of idle power consumption, where the system is not fully active but is not in a traditional sleep state (S1-S5) either.
In S0ix states, the system appears to be completely on and responsive from a user’s perspective, but various parts of the hardware are in a low-power state.
The intention is to save power during periods of inactivity, even short ones, without disrupting the user experience.
Here’s how it works: when the system is idle, it transitions to an S0ix state. When user interaction resumes or a task requires more resources, the system quickly transitions back to the full-power S0 state.
This transition happens so swiftly that it’s typically unnoticeable to the user.
In other words, S0ix states allow a computer to save power without fully entering a sleep state and without noticeable impact on performance or responsiveness.
These states are especially useful in battery-powered devices, like laptops and tablets, where power efficiency is crucial.
However, achieving these power savings requires support at both the hardware and software level.
The hardware components must be able to transition to low-power states individually, and the operating system must be able to manage these transitions effectively.
Ultimately, the S0ix states represent a significant advance in power management, allowing systems to maintain responsiveness while significantly reducing power consumption during periods of inactivity.
S1: Power On Standby
S1 is the most basic sleep state. When your computer enters S1, the processor stops executing instructions, but both it and the RAM remain powered.
The rest of the system remains fully powered, allowing it to respond quickly when you need it again. This state primarily saves power while being quick to resume, making it useful when you intend to pause work briefly.
Pros
— Quick resume time due to processor and RAM remaining powered
— Continuity of operation as the system can quickly return to the S0 state
Cons
— Lowest power-saving among all sleep states
— Processor and RAM continue to draw power
S2: CPU Off
The S2 state is similar to S1, but the processor is also powered off. S2 saves more power than S1 because it turns off the processor and emptying the system cache.
RAM remains powered and retains its content.
Pros
— Greater power savings than S1 due to the processor being powered off
— Moderately quick resume time due to RAM retaining its content
Cons
— Longer wake-up time compared to S1
— Still considerable power draw due to RAM being powered
S3: Standby or Sleep
In the S3 state, commonly known as «Sleep» or «Standby,» both the processor and RAM go into a low power mode.
System context is saved in RAM, and other parts of the system may also be powered down. The system can quickly resume because the context is stored in RAM.
Pros
— Significant power savings as both the processor and RAM go into low power mode
— Quick resume time as system context is saved in RAM
Cons
— Potential data loss if power is interrupted as context is stored in volatile memory (RAM)
— Some hardware devices may not support S3, causing problems during the resume
S4: Hibernation or Suspend to Disk
In S4 state, also known as «Hibernation» or «Suspend to Disk,» the system saves its context to the hard drive and powers off all hardware.
Upon resuming, the system reads the saved context from the hard drive and returns to the state it was in before entering S4.
Pros
— No power draw as all hardware is powered off, ideal for long periods of inactivity
— System context is preserved, enabling resume of operations
Cons
— Longer resume time compared to S3 as system context needs to be read from the hard drive
— Requires enough disk space to save the system context
S5: Soft Off
S5 state, also known as «Soft Off» or «Shutdown,» is the state where the computer appears to be off.
The operating system has shut down, and the system context is not retained. In this state, no activities are taking place, and no power is drawn except a minimal amount to listen for a wake event.
Pros
— Maximum power savings, as nearly all components are powered off
— System starts fresh after an S5 state, often resolving many software issues
Cons
time, as the system needs to go through the entire boot process
— All unsaved data is lost
Troubleshooting and System Sleep States
Understanding system sleep states can aid in troubleshooting hardware and software issues.
For example, if a system experiences difficulties waking from a sleep state, it could indicate driver or hardware issues.
If a device fails to enter or exit a sleep state correctly, updating the device drivers or the system BIOS might solve the issue.
In other cases, disabling specific sleep states in the BIOS can serve as a workaround for faulty hardware or software that doesn’t handle these states correctly.
Problems with S4 (Hibernation) might point towards insufficient disk space, as S4 requires enough space to save the system context.
The S5 state (Soft Off) can often resolve software issues due to the fresh start that comes with a full system reboot.
Conclusion
System sleep states S0 through S5 are critical for managing a computer’s power consumption and operational convenience. While they solve crucial problems around power usage and system performance, they also present specific challenges.
Nonetheless, understanding these states can provide key insights into system operations and significantly aid in system troubleshooting.
S5 maximum power savings что это
Назначение параметра: Параметр включает/выключает энергосберегающие режимы S4/S5.
S4 — режим сна,
S5 — компьютер выключен.
Вывести из одного из этих двух состояний компьютер можно нажатием на клавишу Power либо, если было установлено включение по расписанию.
Возможные варианты значений:
Disabled — режимы S4/S5 отключены,
Enabled — режимы S4/S5 включены.
КОММЕНТАРИИ к «Deep S4/S5»
ДРУГИЕ МАТЕРИАЛЫ ПО ТЕМЕ
Проявления неисправностей, связанных с данным параметром (0)
IT-WIKI (0)
Параметры BIOS (91)
Описание значений параметров:
Disabled — параметр отключен,
Enabled — параметр включен. Доступны опции настройки даты и времени пробуждения: Wakeup Date, Wakeup Hour, Wakeup Minute, WakeupSecond
Описание значений параметров:
Disabled — выход запрещен,
Enabled — выход разрешен.
Описание значений параметров:
X — значение в вольтах.
Описание значений параметров:
X — значение секунды от 0 до 59.
Описание значений параметров:
X — значение минуты от 0 до 59.
Описание значений параметров:
X — значение часа от 0 до 23. Если равно 0, то компьютер будет включен в полночь
Данный параметр (обратная связь при перегреве) определяет, должен ли процессор сбрасывать частоту (троттлинг) при поступлении сигнала о перегреве подсистемы его питания на материнской плате.
Чем выше частота процессора и напряжение его питания, тем выше нагрузка на подсистему питания на материнской плате. Которая приводит к нагреву элементной базы (дроссели, транзисторы, конденсаторы), которая также может выйти из строя. При достижении температуры подсистемы питания до критического уровня (как правило 80 гр.по Цельсию), подсистема посылает об этом сигнал в процессор, который должен сбросить свою частоту, чтобы уменьшить нагрузку на подсистему питания.
Подсистемы питания, обладающие такой возможностью, входят в состав материнских плат компании ASUS и носят название Extreme Engine DIGI+ (I, II, III версии). И, вследствие этого, данный параметр можно встретить в БИОС (UEFI) материнских плат этой компании.
Описание значений параметров:
Auto — Значение автоматически выбирается системой.
Disabled — Процессор будет игнорировать сигналы подсистемы питания о ее перегреве и не будет сбрасывать частоту. Выключать этот параметр стоит, если вы уверены, что компоненты подсистемы хорошо охлаждаются.
Enabled — Процессор будет сбрасывать частоту при перегреве подсистемы питания.
Проявление неисправностей: Отключение параметра может привести к повреждению материнской платы, особенно, если процессор разогнан.
What is S5 maximum power savings?
“S5 Maximum Power Saving” – Enabling this option reduces the power required for the system as much as possible when the system is in the Power Off (S5) state. While in the S5 state, power is removed from the wake-up circuitry, the expansion slots, and any management features.
What is DevSleep in SSD?
DevSlp or DevSleep (sometimes referred to as device sleep or SATA DEVSLP) is a feature in some SATA devices which allows them to go into a low power “device sleep” mode when sent the appropriate signal, which uses one or two orders of magnitude less power than a traditional idle (about 5 mW, but some drives can get as …
What is RTD3?
• Runtime D3 (RTD3) – Refers to the placement of a device into D3hot/cold while. the rest of the platform remains in a S0 state.
What is aggressive LPM support?
–Aggressive LPM Support. —Enables or disables the power saving feature, ALPM (Aggressive Link Power Management), for the Chipset SATA controllers. ( Default: Enabled)
What is LPM support in BIOS?
From the BIOS section of the manual: Peripherals. -SATA Configuration. –Aggressive LPM Support. —Enables or disables the power saving feature, ALPM (Aggressive Link Power Management), for the Chipset SATA controllers. (
What is SATA 6g hot plug?
Hot plugging is the addition of a component to a running computer system without significant interruption to the operation of the system. Hot plugging a device does not require a restart of the system. This is especially useful for systems that must always stay running, such as a server.
What is SATA mode selection?
The SATA Mode BIOS feature is similar to the SATA Operation Mode BIOS feature, but with different options available. It controls the SATA controller’s operating mode. When set to SATA or AHCI, the SATA controller enables its AHCI functionality.
What is Wake system from S5?
The wake-on-LAN (WOL) feature wakes the computer from a low power state when a network adapter detects a WOL event (typically, a specially constructed Ethernet packet). WOL is supported from sleep (S3) or hibernate (S4). It is not supported from fast startup or soft off (S5) shutdown states.
What is S5 state PC?
System power state S5 is the shutdown or off state. Similar to a system in a sleeping state (S1 through S4), a system in S5 is not performing any computational tasks and appears to be off. When in state S4, the computer can restart from the hibernate file; restarting from state S5 requires rebooting the system.
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Configuration Manager and OSD with a side of PowerShell
Configuring WoL with CM for HP Desktops – Part 2
[Download exported Configuration Baseline and Configuration Items here. This includes the CIs from Part 2 and Part 3.]
In Configuring WoL with Configuration Manager – Part 1, I covered the settings that are required to enable Wake-On-LAN that are not hardware manufacturer specific. In Part 2, I am going to go over the BIOS (UEFI) specific settings for current model HP desktops. There are multiple ways to configure BIOS settings on HP desktops and laptops. HP provides the BIOS Configuration Utility, which is a command line utility that can be used to get and set BIOS settings and can even be used to set multiple settings using an answer file. HP also provides the HP Client Management Script Library (CMSL), which is a collection of PowerShell functions that not only allow managing BIOS settings, but can also be used to download driver and firmware updates. Another method for managing HP systems is by using the HP Manageability Integration Kit (HP MIK). The HP MIK is a client management console extension for Microsoft Endpoint Manager Configuration Manager (MEMCM – previously called System Center Configuration Manager). However, my favorite way to get and set BIOS settings is just doing it directly with WMI (via PowerShell), as this does not require any additional dependencies and can be done in Windows 10 or WinPE.
For configuring the HP desktop WoL settings, I will be using Configuration Manager Configuration Items (CIs) that are deployed via a Configuration Baseline. CIs can not only be used to report on settings, they can also be used to enforce settings and manage drift. Unlike GPOs, reporting is natively built in to Configuration Manager, which makes compliance reporting really easy.
The current HP desktop models have two BIOS settings that need to be configured in order to perform successful WoL – “Wake On LAN” and “S5 Maximum Power Savings“. If power utilization is not a concern and you want to add a little more redundancy to systems that should always stay up, there are a few other settings that are of interest. The first one is what the system should do in the event of a power loss and is called “After Power Loss“. The other settings have to do with the capability of enabling a power on event and can power on a system at a pre-determined hour, minute and day. These settings are: “BIOS Power-On Hour“, “BIOS Power-On Minute“, “Sunday“, “Monday“, “Tuesday“, “Wednesday“, “Thursday“, “Friday“, and “Saturday“.
The following chart summarizes the settings, the values that I am going configure, and the possible values. These settings will enable WoL (to boot to the hard drive), disable S5 Maximum Power Savings (which if enabled will prevent WoL from being successful), always turn the system back on after a power loss, and enable the system to power up every day at 4:44 AM:
| Setting | Value | Possible Values |
| Wake On LAN | Boot to Hard Drive | Disabled, Boot to Network, Boot to Hard Drive, Boot to Normal Boot Order |
| S5 Maximum Power Savings | Disable | Disable, Enable |
| After Power Loss | Power On | Power Off, Power On, Previous State |
| BIOS Power-On Hour | 4 | 0-23 |
| BIOS Power-On Minute | 44 | 0-59 |
| Sunday | Enable | Disable, Enable |
| Monday | Enable | Disable, Enable |
| Tuesday | Enable | Disable, Enable |
| Wednesday | Enable | Disable, Enable |
| Thursday | Enable | Disable, Enable |
| Friday | Enable | Disable, Enable |
| Saturday | Enable | Disable, Enable |
As mentioned above, I like configuring BIOS settings using CIs. When creating a CI that may or may not be applicable to other systems, it is a good idea to create an Application type CI (instead of an Operating System type CI). This way detection logic can be applied to see if the CI should or should not be evaluated on a system. For BIOS settings, I like to limit my CIs to the hardware models that I have certified and tested that it actually works. For HP models, I use the Win32_Baseboard Product identifier. The custom script for the HP desktop detection logic is the following:
This corresponds to the following HP desktop models: HP ProDesk 400 G3(8062)/G4(82A2)/G5(83F2),600 G2(805D/8053), 600 G3(829E), 600 G4(83EF). NOTE: Add your own models here in each of the CI Detection Methods.
For the CI Name and CI Setting Name, I like to use the following naming structure for easy identification and purpose:
So for the HP Desktop WoL setting would look like the following:
HP BIOS – Desktop – Wake On LAN
For the CI Description, I like to include the desired setting value and the models that are supported. For the HP Desktop WoL setting I have the following:
Boot to Hard Drive:HP ProDesk 400 G3(8062)/G4(82A2)/G5(83F2),600 G2(805D/8053), 600 G3(829E), 600 G4(83EF)
I also like to use categories for easy searching/filtering and use “BIOS Settings” and “WoL” for this CI. The CI General tab looks like the following:
CI Setting Name is the same:
I also like to keep the Discovery Script modular so that it is easy to re-use for multiple BIOS settings. By keeping the Setting name at the top of the script, that is the only thing that needs to be changed for creating Discovery Scripts for other BIOS settings. For HP Desktop WoL the discovery script would be the following:
The Compliance Rule will be a string value that should be compared to the desired setting. In this case, I want this setting to be equal to “Boot to Hard Drive” and I want to run the remediation script when the setting is non-compliant. NOTE: In order for the “Run the specified remediation script when this setting is noncompliant” to be visible, there needs to be a remediation script defined which is below.
Like the modular Discovery Script, I also like to keep the Remediation Script modular so that it is easy to re-use for multiple BIOS settings. By keeping the Setting name, setting value and BIOS password at the top of the script, that is the only thing that needs to be changed for creating Remediation Scripts for other BIOS settings. For HP Desktop WoL the remediation script would be the following:
In order to change a BIOS setting, a BIOS password is required if one is set. Above is one method for a single static BIOS password. If you have multiple static BIOS passwords or dynamic BIOS Passwords, then more would need to be done in order to determine the correct BIOS password to use. This approach is more secure than using the BIOS Configuration Utility and the password bin file (because getting the password bin file is like having the password. Plus the password bin file is easy to crack if you really did need to get the password). If CM is secured properly (which it should be, otherwise you have more important things to worry about), then only the CM admin (or admins) that are scoped to manage CIs will be able to read these directly in the console. Getting the password from the Management Point is probably not impossible, but it would require a bit of work and some luck. As for the client, I have yet been able to find it. However, if there is a way to easily grab this information, please reach out to me and let me know via the comments below or a DM on Twitter.
The other settings, S5 Maximum Power Savings and After Power Loss, follow the same approach. For the daily Power-On, I combine each setting in the same CI and it will look like the following:
Lastly, we need to create a Configuration Baseline. I like to use a similar naming structure for easy identification and purpose:
So for these WoL settings I use the following:
BIOS Settings – WoL – Desktop Pre-Prod
I like to duplicate Baselines (and even some CIs) into a production and pre-production. That way it is easy to test and make changes once it is already rolled out to production.
For the Baseline Description, I like to include a brief description for the Baseline. For this Baseline, I use the following:
Enabled WoL Settings and daily Power On settings on select desktops
Just like the CI, I also like to use categories for easy searching/filtering and use “BIOS Settings” and “WoL” for this Baseline. The Baseline General tab looks like the following:
Since all Settings might not apply to all targeted systems, it is very important to change the “Purpose” from “Required” (default) to “Optional”. Otherwise, systems that are not applicable will show up as non-compliant.
This Configuration Baseline can now be deployed to a target collection. Be sure to enable “Remediate noncompliant rules when supported” (and “Allow remediation outside of maintenance window” if desired).
If you have made it all the way to the bottom of this post, thanks for reading and congratulations! Hopefully this helps you to configure your systems for Wake-On-LAN so that they can be woken up and/or kept powered on during this time when there is a push to get more people to work from home. It will also help with other deployments, upgrades and patching as well. Now scroll back up to the top and download the provided Configuration Baseline and Configuration Items, modify them for your HP models and test it out in your environment. In Part 3, I cover the BIOS/UEFI specific settings for current model Dell desktops.
Windows Advanced Power Options Explained
By default, all Windows 7 (and Vista) notebooks come with three power plans: High Performance, Balanced, and Power Saver. Some manufacturers, such as HP, Samsung, and Toshiba, include custom power profiles, and may provide proprietary programs for controlling them. Nevertheless, administrator-level users can always tweak a power profile for better performance or more battery life.
The path to the advanced power settings is a twisty one: Control Panel > Power Options > Change Plan Settings > Change Advanced Power Settings. Once you’ve reached the center of this labyrinth, you’re faced with a list of options that would have daunted mighty Theseus himself. Many are intuitive and easy to understand, though it’s not always clear how changing them will impact performance.
To help you out, we’ve put together this in-depth guide to Windows’ Advanced Power Options and included descriptions, tips and recommendations for all of the default options on Windows 7 and most Vista systems. The majority of these menus offer separate settings for whether you’re drawing power from the battery or while you’re plugged in. Depending on the manufacturer and your hardware (hard drive vs. solid state drive), your notebook may include settings not listed here. Understanding the defaults will make it easier to tweak any others you come across.
Hard Disk: Turn Off Hard Disk After
Spinning the hard disk doesn’t consume a lot of juice. Plus, the power saved by turning off the drive varies depending on the manufacturer. For extreme battery savings, set the idle/turn off time to 10 or 20 minutes. Keep in mind that this time limit should be shorter than that set for putting the machine to sleep; otherwise, you’ll see no change in battery life.
Desktop Background Settings: Slide Show
Windows 7 allows users to set multiple background images that change after a user-defined interval. On battery power, set the slideshow to Paused instead of Available if you want to get the most out of your battery. The power drain might not be much, but you’ll miss that extra juice once you’re down to 10 percent.
Wireless Adapter Settings: Power Saving Mode
Here you’ll find four choices: Maximum Performance, Low Power Saving, Medium Power Saving, and Maximum Power Saving. The amount of power you’ll conserve with these settings varies by wireless card manufacturer. Performance generally goes down the higher the savings, meaning Maximum Power Saving mode could cause wireless downloads to take longer than usual. If you need a speedy Internet connection, set this to Maximum Performance or Low Power Saving, and then turn your Wi-Fi antenna off when you don’t need it.
Advanced Power Options Explained
Page 1: Hard Disk, Desktop Background Settings, and Wireless Adapter Settings
Sleep
- Sleep After. Allows users to save battery life or energy by putting a notebook in a low-power state after a set amount of time. Waking from sleep should only take about a second, opening right where you left off. The amount of power a notebook uses while sleeping depends on several factors, including the manufacturer. The draw can be as little as 5 to 15 watts.
- Allow Hybrid Sleep. This is a function more useful in desktops than in notebooks, because it’s designed to protect a session from sudden power loss. Hybrid sleep works by writing a hibernation file when your computer enters a sleep state, allowing for a fast wake time. If you lose power completely and suddenly, which is less likely with a laptop, the system uses the stored file to wake from hibernation, restoring your system’s state. Enabling it won’t impact your notebook negatively, though it will take up some hard drive space.
- Hibernate. Saves power by creating a hibernation file on the hard disk and shutting the computer down. The power draw here is extremely low, with many notebooks able to last for weeks without being plugged in. However, waking from hibernation takes longer than sleep—sometimes as long as it takes for your notebook to boot. As with sleep, the user’s session is saved and ready to go. For moderate battery savings, use hibernation if you won’t need your laptop for two hours or more. For extreme savings, hibernate after 45 to 60 minutes.
- Allow Wake Timers. Applications or utilities programmed to run or perform tasks at specific times—such as Windows Update—can wake a notebook from sleep if Wake Timers are allowed. When running unplugged, disable this function to keep your notebook from draining battery life.
Advanced Power Options Explained
Page 2: Sleep and Hibernation Settings
USB Settings: USB Selective Suspend Setting
Most USB devices don’t need to draw power the entire time they’re plugged in. With this setting enabled, the drivers controlling the ports that know which peripherals and devices aren’t needed can shut each one off individually to conserve battery power. The amount saved depends on what you have plugged into the ports.
Processor Power Management: Minimum Processor State vs. Maximum Processor State
Windows includes device driver support that allows a notebook to determine the optimal power performance state depending on the tasks it’s running. By setting the minimum processor state, you allow for a range of usage that can save on battery life if the computer isn’t engaged in taxing activities such as playing video or soaring over Google Earth. Even at the default setting—5 percent—your notebook won’t slow the processor if you need the juice. You can set a lower maximum processor state to glean more battery life from your system.
Advanced Power Options Explained
Page 3: USB Settings and Processor Power Management
Display
- Dim Display After vs. Turn Off Display After. For maximum battery life conservation, consider skipping the Dim setting and set the screen to turn off completely after 10 minutes. It should take less than a second to bring it back when you’re ready to use your notebook.
- Display Brightness. The backlight in a notebook’s LCD is the biggest power hog of any component. Experienced road warriors know to turn the brightness down to make a battery last longer, but how low is low enough? When we perform the LAPTOP Battery Test to determine a notebook’s longevity, we set brightness at 40 percent, which is a good balance between conservation and visibility. Depending on the model, a screen may be legible at as low as 20 percent. Play around with the settings to find a comfortable brightness, then set it as the default.
- Dimmed Display Brightness. Determines how far down to take the brightness if you use the Dim Display After setting. We recommend skipping this setting.
Multimedia Settings
- When Sharing Media. When your notebook is sharing music, video, or other media via a program such as Windows Media Center, Windows doesn’t automatically count the streaming as activity if you aren’t actually using the laptop, and may read it as being idle. When plugged in, set the notebook to Prevent idling to sleep to keep the stream going. To save a little energy, choose Allow the computer to enter Away mode, which makes a notebook appear to be sleeping even though it’s not. As this is not a true sleep state, and won’t conserve much energy, don’t choose this setting when running on the battery. Instead, choose Allow the computer to sleep.
- When Playing Video: Optimize Video Quality, Balanced, and Optimize Power Savings. Balanced is a good choice if you need your notebook to keep you entertained on a long commute. When plugged in, you’ll want the best video quality unless you’re trying to conserve watts. Should you need to watch video but also save battery life just as badly, choose Optimize Power Savings.
Advanced Power Options Explained
Page 4: Display and Multimedia Settings
Battery
Confused about how to rank low, critical, and reserve battery? You’re not alone. Oddly, these settings aren’t arranged in priority order within the Power Options menu. The correct order is: Low Battery, Reserve Battery, Critical Battery. Whatever percentage you give the Low setting, it must be higher than Reserve, which must be higher than Critical.
- Critical Battery Action offers options for Do Nothing, Sleep, Hibernate, and Shut Down. Unless you’re running a battery test, we don’t suggest utilizing the Do Nothing setting; Sleep or Hibernate will save your work. Shut Down is pretty extreme, particularly if you’ll be near an outlet within a day or so.
- The Low Battery Level default of 11 to 15 percent is a good idea because it provides ample warning of an impending shut down without leaving you so little battery that you can’t finish what you’re doing.
- Critical Battery Level can be set to as little as 3 percent, but remember you will need some power for the Hibernate setting and even more for Sleep. Staying at the default 5 percent will let you get the most out of your battery while retaining enough juice for Hibernation. Enter 10 percent if you set the Critical Battery action for Sleep.
- Low Battery Notification causes your notebook to display a pop-up warning when your battery is running low, alerting you when it hits the percentage you set in the Low Battery Level option.
- Low Battery Action offers options to Do nothing, Sleep, Hibernate, and Shut Down. If set to Sleep or Hibernate, a notebook will perform this action shortly after the notification. Users can turn the notebook back on to finish a task, but we recommend setting this to Do Nothing to give you time to prepare for the battery’s inevitable death, or to find the power cord.
- Reserve Battery Level is the percentage of battery left at which point your notebook will flash a warning, whether the low battery notification is on or off. If you’ve ignored the previous warning, 7 percent here will at least give you a few minutes to shut down before being cut off in the middle of a task.
Advanced Power Options Explained
Page 5: Battery Settings
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S5 Maximum Power Savings
S5 — Такое состояние энергосбережения компьютера, при котором его блок питания продолжает работать, подавая питание на кнопку включения/выключения системного блока, позволяя вернуть систему в состояние G0. Требуется перезагрузка, т.к. данные не сохраняются. Другие компоненты могут оставаться под напряжением, поэтому компьютер может «проснуться» при вводе с клавиатуры, часов, модема, локальной сети или USB-устройства.
Включение этого параметра позволяет дополнительно снизить потребление энергии компьютером в состоянии S5 до 0,5 Вт за счет того, что станет невозможным пробудить компьютер внешними устройствами: мышью, клавиатурой, сигналом из сети и пр..
Возможные варианты значений:
Disable — Параметр выключен.
Enable — Параметр включен.
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Проявления неисправностей, связанных с данным параметром (0)
IT-WIKI (2)
ID материала: 7833 / Дата публикации: 27.06.2018 / Просмотров: 227
Advanced Power Management (APM) — это технический стандарт управления питанием, разработанный Intel и Microsoft и выпущенный в 1992 году, который позволяет операционной системе IBM-совместимого персонального компьютера взаимодействовать с BIOS с целью управления питанием компонентов компьютера.
APM является предшественником ACPI (Advanced Configuration and Power Interface) — усовершенствованного интерфейса управления питанием и конфигурацией компьютера.
G0, G1, G2, G3, S0, S1, S2, S3, S4, S5, D0, D1, D2, D3, P0, P1, P2, P3 /
ID материала: 10338 / Дата публикации: 20.11.2015 / Просмотров: 1192
Параметры BIOS (110)
Описание значений параметров:
Disabled — параметр отключен,
Enabled — параметр включен. Доступны опции настройки даты и времени пробуждения: Wakeup Date, Wakeup Hour, Wakeup Minute, WakeupSecond
Описание значений параметров:
Disabled — выход запрещен,
Enabled — выход разрешен.
Описание значений параметров:
Enabled — пробуждение при подключении USB-устройства включено.
Disabled — пробуждение отключено.
Описание значений параметров:
Enabled — индикация включена.
Disabled — индикация отключена.
Особенности:
В зависимости от уровня состояния энергосбережения будет разная индикация:
S0 — индикатор горит зеленым цветом.
S3 — 3 мигания с частотой 1 Гц (индикатор горит 50% времени), затем пауза 2 секунды (зеленый индикатор), то есть повторяющиеся циклы из трех миганий и паузы.
S4 — 4 мигания с частотой 1 Гц (индикатор горит 50% времени), затем пауза 2 секунды (зеленый индикатор), то есть повторяющиеся циклы из четырех миганий и паузы.
S5 — индикатор не горит.
Описание значений параметров:
X — значение в вольтах.
Описание значений параметров:
X — значение секунды от 0 до 59.
Описание значений параметров:
X — значение минуты от 0 до 59.
Описание значений параметров:
X — значение часа от 0 до 23. Если равно 0, то компьютер будет включен в полночь
Данный параметр (обратная связь при перегреве) определяет, должен ли процессор сбрасывать частоту (троттлинг) при поступлении сигнала о перегреве подсистемы его питания на материнской плате.
Чем выше частота процессора и напряжение его питания, тем выше нагрузка на подсистему питания на материнской плате. Которая приводит к нагреву элементной базы (дроссели, транзисторы, конденсаторы), которая также может выйти из строя. При достижении температуры подсистемы питания до критического уровня (как правило 80 гр.по Цельсию), подсистема посылает об этом сигнал в процессор, который должен сбросить свою частоту, чтобы уменьшить нагрузку на подсистему питания.
Подсистемы питания, обладающие такой возможностью, входят в состав материнских плат компании ASUS и носят название Extreme Engine DIGI+ (I, II, III версии). И, вследствие этого, данный параметр можно встретить в БИОС (UEFI) материнских плат этой компании.
Описание значений параметров:
Auto — Значение автоматически выбирается системой.
Disabled — Процессор будет игнорировать сигналы подсистемы питания о ее перегреве и не будет сбрасывать частоту. Выключать этот параметр стоит, если вы уверены, что компоненты подсистемы хорошо охлаждаются.
Enabled — Процессор будет сбрасывать частоту при перегреве подсистемы питания.
Проявление неисправностей: Отключение параметра может привести к повреждению материнской платы, особенно, если процессор разогнан.
что такое s5 в биос
G1 (S1, S2, S3, S4) – режимы уменьшенного энергопотребления, о которых мы поговорим чуть ниже.
G2 (S5) – программное выключение. В данном состоянии компьютер выключен, но блок питания находится под напряжением.
G3 – состояние в котором питание полностью отключено от блока питания (БП).
Режимы уменьшенного энергопотребления (S1, S2, S3, S4):
S1 (Power On Suspend, POS, Doze) – режим энергосбережения, при котором отключается монитор, винчестер, но на центральный процессор и ОЗУ (модули оперативной памяти) питание подается, снижается частота системной шины. Процессорные кэши сброшены, процессоры не выполняют инструкции, отключен генератор тактовой частоты ЦП.
S2 (Standby, Standby Mode) – режим уменьшенного энергопотребления. При данном режиме происходит отключение монитора, винчестера. От ЦП отключается напряжение питания. Останавливаются все тактовые генераторы (продолжают работать только те тактовые генераторы, которые необходимы для работы оперативной памяти). Питание подается только на системную память (в ней хранится информация о состоянии системы).
S3 (Suspend to RAM, STR, Suspend) – ждущий режим. При данном режиме энергосбережения питание подается только на оперативную память (в ней хранится информация о состоянии системы). Все другие компоненты ПК отключены.
S4 (Suspend to Disk, STD, Suspend to Hard Drive, S4-Hibernation) – глубокий сон. При данном режиме энергосбережения текущее состояние системы записывается на винчестер, после чего следует отключение питание всех компонентов ПК.