Thanks. From what I gather I can put in both and the kernel takes care of it.
> If you're going to do that you'll need to get ACPID and set it up in place > of APMD. Otherwise ACPI isn't going to do much for you. There may also > be kernel patches involved. ACPI has been under very heavy development as > it is one of the subsystems being enhanced in 2.5.x. > > http://acpid.sourceforge.net/ > > Seemed like a good place to start, though it's a bit thin on > documentation. > > > On Sat, 21 Dec 2002 00:03:49 -0500 > "Brett I. Holcomb" <[EMAIL PROTECTED]> wrote: > >> Thank you! So I should choose ACPI when I build a kernel since my board >> supports it and disable APM. >> >> > On Fri, 2002-12-20 at 23:14, Brett I. Holcomb wrote: >> >> What is the difference in APM vs ACPI for power management? Are they >> >> two exclusive methods of controling shutdown, etc. or is ACPI an >> >> advanced >> >> version of APM? When I build a kernel can I specify both or do I >> >> choose one? >> > >> > >> > Well, here is the difference between the two (At least as I understand >> > it): >> > >> > APM is a a BIOS-based scheme of system power management. It provides >> > CPU and device power management and uses device activity timeouts to >> > determine when to transition devices to low power states. >> > >> > However, APM falls short: >> > >> > 1.) Every BIOS has its own power management scheme. There is no >> > consistancy between manufacturers. Each BIOS developer must refine and >> > maintain their own APM BIOS code and functionality. >> > >> > >> > 2.) The reason for a suspend is never known. >> > >> > >> > 3.) The BIOS is unaware what the user is doing. Ultimately, the BIOS >> > makes a mess of everything. >> > >> > 4.) The BIOS knows nothing about USB devices, add-in cards and IEEE >> > 1394 devices. >> > >> > >> > ACPI was developed to overcome the deficiencies in APM. ACPI (Advanced >> > Configuration and Power Interface) is an open industry specification. >> > >> > ACPI evolves the existing collection of power management BIOS code, >> > Advanced Power Management (APM) application programming interfaces >> > (APIs, PNPBIOS APIs, Multiprocessor Specification (MPS) tables and so >> > on into a well-defined power management and configuration interface >> > specification. The specification enables new power management >> > technology to evolve independently in operating systems and hardware >> > while ensuring that they continue to work together. >> > >> > Unlike APM, ACPI allows the Operating System (instead of the BIOS) to >> > control Power Management (OSPM). The support code provided by the BIOS >> > is not written in the native assembly language of the platform but in >> > AML (ACPI Machine Language). The BIOS does not determine the policies >> > or time-outs for power management or resource management. >> > >> > >> > There are 4 device states under APM: Enabled, Standby, Suspend and Off. >> > >> > ACPI's device states are extended, with 4 major global states: Working >> > (S0), Sleeping (S1-S3), Soft-Off (S4), and Mechanical-Off (S5). >> > Sleeping is further broken down into 3 substates.The ACPI BIOS tables >> > define what these states mean for individual devices, and the operating >> > system determines when to move a device, or even the entire system, >> > from one state to another. >> > >> > The ACPI-compatible OS mainly acts as a swap manager that swap the >> > computer to different state based on the information collected. A >> > transition from one state to another is first started with the OSPM >> > system code which instructs the OS kernel for the specific state >> > transition. After the kernel receives the instruction, it asks the >> > appropriate device driver to perform the operation. Response from the >> > operation will be passed back to the OSPM from the kernel. This process >> > will proceed in hierarchical order until all devices and components >> > reach a specified state. >> > >> > There is more, but the above info is probably enough............... >> > >> > >> > >> > Best >> > >> > Peck >> >> -- >> Brett I. Holcomb >> [EMAIL PROTECTED] >> AKA Grunt <>< >> Registered Linux User #188143 >> Remove R777 to email >> _______________________________________________ >> Linux-users mailing list >> [EMAIL PROTECTED] >> Unsubscribe/Suspend/Etc -> >> http://www.linux-sxs.org/mailman/listinfo/linux-users -- Brett I. Holcomb [EMAIL PROTECTED] AKA Grunt <>< Registered Linux User #188143 Remove R777 to email _______________________________________________ Linux-users mailing list [EMAIL PROTECTED] Unsubscribe/Suspend/Etc -> http://www.linux-sxs.org/mailman/listinfo/linux-users
