Windows power save

I'm collecting here material about PC Power Saving. I'm going to edit it when I have time.
Under work 21.06.04

Hibernate your PC !

Reduce the total power consumption of your PC by closing or hibernating it. Your PC goes to S5 state, where everything is copied to special file from the memory and the power is shut down. When you want to start again, you just press Power on. The PC starts and loads everything to the state it was before hibernation.
One good method is to make PC hibernate automatically at a prescheduled time. You can possibly find many programs to be used for this, but here is one:

SHUTDOWN.EXE (Original site of Andrej Budja at 21.06.2004)

Here is how:

-download SHUTDOWN.EXE (This is a copy in my server).
-Start + Control Panel + Scheduled Tasks
-Add scheduled task
-Browse and find this SHUTDOWN.EXE
-Set 'Perform this task Daily'
-select the time and day you want this task to start
-Enter the name and password of a user.
-Remember to mark 'Open advanced properties for this task, when I click Finish'
-Remember to add parameter '-h' to the last properties window
-check also the Schedule and Settings pages

You can check and change the parameters selecting Start + Control Panel + Scheduled Tasks.

Tufts

1. Turn off your computer at night and when you are not using it for several hours.

2. Turn off your monitor when you are not using your computer for 15 minutes or longer.

3. Enable the Power Management feature for your monitor (see below on how to get instructions).

4. If you buy a new computer, consider a laptop. Laptops use only 1/4 the energy of a desktop*.

5. If you buy a new monitor, consider a flat screen. They use only 1/3 the energy*.

Windows Operating System's Power Management Option Availability
Power Management Option
95
98
NT
Me
2000
Monitor Power Management
Turn off monitor
Yes
Yes
No
Yes
Yes
Monitor standby
Yes
No
No
No
No
Computer /System Power Management
Turn off hard drives
Yes
Yes
No
Yes
Yes
System standby
No
Yes
No
Yes
Yes
System Hibernate
No
No
No
Yes
Yes
Informationweek
Most PCs today support six distinct power modes, or "sleep states," commonly 
defined as S0 through S5.
S1, S2, and S3 all are low-power, energy-saving states from which the PC can be awakened by jiggling the mouse or tapping a key. (Other external events, such as a special kind of LAN packet or an inbound modem call, also can trigger a wake-up, depending on how the system is set up.) When the PC awakens, it picks up from where it left off when the low-power mode kicked in--the same files will be open, the same apps will be running, etc.

S0 as "sleep state zero," or "sleep zero"; in other words, no sleep at all.

S1 is the simplest energy-saving state, often used in older systems whose drivers or hardware won't behave well with more sophisticated levels of power management. A system at the S1 power level simply shuts down the hard drive(s) and monitor, but leaves everything else running normally. S1 is called sleep or standby.

S2 offers greater power savings because it not only powers down the monitor and drives, it also cuts power to the CPU and its cache. Confusingly, this level also is sometimes called sleep or standby.

S3 is a deeper power-savings mode that shuts down almost everything except for the barest trickle of power needed to keep the contents of RAM from fading away and to listen for a wake-up action. In a way, you can think of S3 as a "suspend to RAM" state. In fact, many vendors do refer to S3 as "suspend" mode, but others (alas) may call it standby, sleep, instant on, on now, and the like.

S4 is fundamentally different from levels S1 to S3. It's hibernation, where the system stops all activity, just as if you had shut it off. But S4 is also different from the simple power-off of level S5 because, before powering down, the S4 hibernation system writes the contents of RAM and some CPU settings to a special file on your hard drive

S5 is the highest power-savings mode, representing a complete power-off such as that achieved by a shut down command. The current ACPI general specification (version 2.0) is only about 2 years old, and it's still evolving. The last revision--2.0a--was released in March -03 Most newer systems, add-on devices, and operating systems support the current ACPI spec and thus offer excellent power control. They can, for example, shut down any of several low-power or power-off modes, then resume operation without difficulty. Older systems may not handle power-management tasks so gracefully, and here's why: ACPI replaced an older, less-versatile Advanced Power Management spec, which basically just put the BIOS in control of power management. This is fundamentally different from ACPI, so hardware and software designed for APM may not work well with ACPI, and vice versa For several years in the mid- to late 1990s, APM and ACPI were both in wide play. As a result, it was not at all uncommon for a given system to have an operating system, a system BIOS, and hardware drivers that might be designed either for different power-management standards or different versions of the same standard. If your system supports the current ACPI spec, you may be able to attain very high levels of energy savings by either or both of two methods: First, see what operating-system-level power-management options are available to you. Your PC's BIOS may also offer secondary adjustments. For example, some BIOS setup utilities let you assign a default ACPI power setting to be used whenever the operating system calls for a sleep mode.

www.annoyances.org: One of the most common problems with Windows is its abysmal support for APM (Advanced Power Management). Either Windows won't go into power saving mode when you want it to, or it insists on putting your system in "standby" mode even when all power management options are disabled. Either way, it isn't fun.

* Windows 95 has minimal support, and therefore doesn't pose much of a problem.
* Windows 98 has more support, but it typically doesn't work very well.
* Windows Me has much improved APM support over Windows 98, although occasionally you'll run into an incompatability.
* Windows 2000 and Windows XP will support APM very well, as long as the correct HAL (hardware abstraction layer) is installed.

Regardless of your OS, you should check your system BIOS to see if APM is properly enabled and configured:

* Enter your computer's BIOS setup (press DEL or ESC or something like that just after turning on your system, and your computer is counting through your memory). Contact your computer's manufacuter or refer to your computer's documentation for details specific to your computer.
* Turn the main APM option to Enable or On.
* Important: Set all the lesser APM-related options (such as hard disk timouts and the monitoring of ports) to disable or off. This ensures that Windows is in control of all the APM options, and your BIOS settings don't interfere or conflict with your Windows APM preferences.

Then, set your power-saving preferences in Windows:

* Double-click the Power Management icon (called Power or Power Options in some versions of Windows) in Control Panel. If it isn't there, your computer isn't properly set up - see above.
* Choose the options that best suit your needs, and click Ok when you're done.

Informit
However, APM has a major limitation in that it focuses on the system board and device access information when determining whether to power down devices. The BIOS might know that a PC Card device is present, but it has no way of determining if the card is actually being used. If the hard disk is being used, the BIOS has no way of determining if it is being used by a program or if the operating system is just using it as a page file for virtual memory.
Lawrence Berkeley National Laboratory"As of early 1996, the EPA estimates that upwards of 70% of all new PCs and nearly 100% of all PC monitors sold have power management capability."
"Power management can only save energy if it is enabled and working properly."
" the monitor usually consumes at least twice as much electricity as the CPU"
"Power-management does not reduce the performance of a computer, but simply adds features to reduce their power consumption when not in use. These energy-efficient machines save money on electricity bills and reduce pollution from power plants."


PTMUSTA at UTU.FI