http://bugzilla.kernel.org/show_bug.cgi?id=11976
Summary: D945GCLF2, automatic fan throtteling, kacpid 100% cpu
usage
Product: ACPI
Version: 2.5
KernelVersion: Gentoo 2.6.25-hardened-r9
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: BIOS
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Failing kernel version:
vmlinuz-2.6.25-hardened-r9
Distribution:
Gentoo AMD64 2008.0
Hardware Environment:
D945GCLF2
Software Environment:
GCC x86_64-pc-linux-gnu-3.4.6
sys-devel/binutils-2.18-r3
sys-libs/glibc-2.6.1
Problem Description:
When automatic fan throtteling is enabled in the BIOS, kacpid will hog the cpu.
On the dual core version, it first takes one cpu, then the other. You also
cannot do a soft-shutdown anymore.
There are two threads on the net that explain the problem:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/254326
http://forums.gentoo.org/viewtopic-p-5274191.html#5274191
Steps to reproduce:
Use D945GCLF/D945GCLF2 Hardware and enable automatic throtteling in the BIOS.
Then do some stuff (like installing gentoo) and kacpid will go into "endless
loop".
Solution:
Disable automatic throtteling in the BIOS
I had the same problem with gentoo i686 and amd64 minimal install CD. As I
know, those Boot-CDs use the normal gentoo-sources kernel. So it's not a
"hardened" problem. It also seems that D945GCLF boards are affected too
(although you might also disable acpi completely on this board, but that
doesn't make sense on a dual-core).
This is my first kernel bug report, so I hope I did everything to ensure that
this is a valid bug report. Not sure if this is fixable on the kernel side, but
you may code an exception for those boards in the worst case.
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