kernel 2.6 - acpi and smp -> problem

From: Jens Nixdorf (
Date: 02/07/05

Date: Mon, 07 Feb 2005 18:07:46 GMT

Hi All,

i own a Dimension 8300 with a 3 GHz P IV, which is running some
Linux-Distributions (at the moment gentoo and SuSE 9.2). Since kernel 2.6
is standard for the mainstream distributions like SuSE, Mandrake or Fedora
Core this machine has a problem with acpi and smp. Because of the
HT-capabilities of the P IV it would be logical to use the smp-capabilities
of the linux-kernel. But it doesnt work with this machine. Either I have to
switch smp support off or acpi, otherwise the machine wont boot, but makes
a hard reset some seconds after decompressing the kernel.

But it comes even more strange: If the machine has a cold start, i.e. it was
switched off for at least 30 minutes, the machine is booting very fine with
acpi and smp. But never a second time. No matter which OS was running
before. I tried until now Fedora Core 3 with ist standard kernel (2.6.9?),
SuSE 9.2 with its standard-kernel 2.6.8, gentoo with its dev-kernel 2.6.10
and even with an actual vanilla-kernel.

With an selfbuilt machine with the ASUS P4C800-Board and the same processor
all these systems are running very well. What is the difference between
DELL and ASUS in this case? And is there a solution for this problem
(without changing the machine)? And are there any other options for acpi
than acpi=off or acpi=ht and what do they do?

Thanks, Jens

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