APM vs ACPI

[Jim Bonnet]

kwall at kurtwerks.com wrote:
> Feigning erudition, Brett I. Holcomb wrote:
> % Okay, I see now.  Thank you (I don't have much erudition on this subject 
> % <G>).
> % 
> % > Feigning erudition, Brett I. Holcomb wrote:
> % > % Thank you!  So I should choose ACPI when I build a kernel since my board
> % > % supports it and disable APM.
> % > 
> % > Actually, if you compile in both, the kernel will use ACPI by default
> % > and disable APM, otherwise it will use APM. You can have both at the
> % > same time, but the kernel handles that for you. See Documentation/apm.txt
> % > in the kernel source tree for some more information.
> 
> Err, I meant "You can have both compiled in at the same time, but you
> can't *use* both at the same time...
> 
> Kurt

Good discussion on this topic.. I'd like to add that during some of my 
testing on UnitedLinux 1.0 w/2.4.19 kernel, which has acpi enabled, we 
found all kinds of wierdness going on from NIC's that weren't recognized 
or couldn't ping out on the lan to SCSI issues where the kernel couldn't 
initialize the hardware on the SCSI chain.

SuSE told us to us ACPI=OFF or ACPI=OLDBOOT..These boot options did fix 
the problem. Seems that the ACPI stuff in the 2.4.19 kernel is a little 
whacky.. So you'll want 2 things, the newest kernel, and its related 
ACPI patches, and a machine with a sufficiently new BIOS.. For example, 
if the BIOS rev date isn't 2000 or later the kernel wont even start the 
ACPI stuff...

Good luck!

Jim