On Tue, 28 Dec 2004 14:48:32 +0100, Alexander Dalloz <ad+lists@xxxxxxxxx> wrote:
> Am Di, den 28.12.2004 schrieb Travis Fraser um 14:30:
> > I remember reading somewhere on this list that for AMD cpu, the kernel
> > boot argument acpi=ht is equivalent to acpi=off.
>
> > Travis Fraser <travis@xxxxxxxxxxxxx>
>
> Not really equivalent.
>
> $ egrep -i 'ACPI|HT'
> /usr/src/linux-2.6.9-1.6_FC2/Documentation/kernel-parameters.txt
> modprobe usbcore blinkenlights=1
> usbcore.blinkenlights=1
> ACPI ACPI support is enabled.
> acpi= [HW,ACPI] Advanced Configuration and Power
> Interface
> Format: { force | off | ht | strict }
> force -- enable ACPI if default was off
> off -- disable ACPI if default was on
> noirq -- do not use ACPI for IRQ routing
> ht -- run only enough ACPI to enable Hyper
> Threading
> strictly ACPI specification compliant.
> See also Documentation/pm.txt, pci=noacpi
>
> Alexander
>
Which means it is equivalent for AMD CPUs and Intel CPUs with no
HyperThreading :). Actually, Dave, you should know that your computer
*was* shutting down, it was just not turning off. From there you
could turn off the power without causing any harm. This is a known
bug and only affects some computers and is a problem with the 2.6.9
kernels, and not specifically FC. If you use ACPI (for example, if
this is a laptop), you might want to just deal with the problem. If
you see no ill effects, go ahead and use "acpi=off" since there is no
advantage, as you said, to using acpi=ht with an AMD CPU.
Jonathan
