APM Legacy
Posted by John-Erik | Filed under Uncategorized
No, APM legacy is for the older APM BIOS. By default, APM is disabled on 99% of APM systems and you have to enable it manually (the few that it does work on are the IBM 760, 770 and 560 ThinkPads, in case you’re curious). ACPI supercedes APM and offers many other features besides just power savings, although the old APM mode is still supported on ACPI systems, it’s not fully supported. If you have an ACPI HAL (hardware abstraction layer) then you will not need to enable ACPI, it’s turned on already. If, however, you have the “Standard PC” HAL or any of the MPS HALs then you will need to change out your HAL to support ACPI, as these only support APM (and the MPS don’t even support that).
To enable ACPI, ensure that when you go into your device manager under “Computer” it says “Advanced Configuration and Power Interface (ACPI) PC”. If it doesn’t, change the driver to read that. You could also try the “ACPI Uniprocessor PC” driver, which might solve your problem as well. You shouldn’t need to reinstall at all to get it to work.
I’ll read some tech docs tomorrow when I get a chance, since I barely have a chance to browse this forum since The Master of JEC252 (TM) is here 
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