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Hardware / Re: Battery and Thinkapad r52
« on: 2012.03.18, 17:02:16 »Quote
While the latest ACPI doesn't help much (actually it might make it worse),
Not in my experience. I have a Lenovo ThinkPad T510, an IBM ThinkPad T43, and an Asus M3A78-EM motherboard, with quad core Phenom processor (desktop). All of them run much cooler (and therefore more efficiently) with ACPI 3.19.15. Versions earlier than 3.19.11 (actually 3.19.13) don't do power reduction without some sort of outside program, and you do need to enable throttling with ACPI 3.19.15, or it doesn't do it either. The installer puts the wrong path in the ACPI Power Manager icon, it is actually in the eCS\BIN directory. Run that, and you can enable the throttling, as well as change other things (probably not recommended unless you understand what you are doing).
I also have an older IBM ThinkPad A22e, that does not do ACPI, so I use APM with it. The (new) battery is good for about 2 hours, while the 15 month old T510 (using ACPI 3.19.15), is good for about the same time. Windows 7, claims that it will do about 3.5 hours, but that is only true if you don't actually use it. The battery goes down a lot faster when you do use it. Windows also powers off more stuff than eCS can (the CD/DVD drive goes off until you press the open button, twice). I suspect that there are some other things that eCS doesn't even know about, like the media card reader, and the Express card slot, that do not get powered off. It also will not power off the screen.
Yes, the battery does get used up faster in eCS, but the actual difference to what windows will do is not as much as you might expect. The new ACPI power saving is much more effective on multi-processor systems because part of what it does, is turn off all but one CPU when the processing power isn't needed, then it turns them back on when it is. My T43 (single processor, running in an SMP setup) can be made to save more power if I use the old SETGETSTATE.EXE program to slow it down. It appears that the new ACPI does not use that method.
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Are there any differences between OS/2 and Ecs concerning APM?
No. APM hasn't changed for many years. It also doesn't do as much for power saving as the latest ACPI does. The main advantage of APM, on my A22e, is that hibernation will work with it. I can't get suspend/resume (never mind hibernation) to work with my T510. Actually I think it does work, but it won't turn the screen back on, so it is difficult to tell. The suspend/resume, and hibernation, is done by the BIOS in the A22e, all it needs is drivers that can do what they are told.
