Kernel Bug Tracker – Bug 12758
ACPI exception with 2.6.29-rc6
Last modified: 2009-03-17 10:00:14 UTC
Subject : ACPI exception with 2.6.29-rc6
Submitter : Heinz Diehl <firstname.lastname@example.org>
Date : 2009-02-23 16:46
References : http://marc.info/?l=linux-kernel&m=123540758700861&w=4
This entry is being used for tracking a regression from 2.6.28. Please don't
close it until the problem is fixed in the mainline.
Created attachment 20350 [details]
Here comes the output of "acpidump"
Created attachment 20368 [details]
revert offending patch from 2.6.29-rc6
Thanks for the acpidump.
The DSDT does indeed defines an opregion covering the ELCR:
OperationRegion (ELCR, SystemIO, 0x04D0, 0x02)
Field (ELCR, ByteAcc, NoLock, Preserve)
However, no AML in the system actually references this opregion,
so the Linux warning is a false positive.
Bob Moore pointed out that if we checked our illegal IO port
address list at run-time rather than init-time, then we'd not
have any warnings on this box; and he volunteered to put that
check into upstream ACPICA.
So I'll delete the init-time check from Linux (we've lived without
it from pre-history until 2.6.29-rc) and we'll test the run-time
ACPICA address validation when it becomes available.
On Wednesday 04 March 2009, Zhang Rui wrote:
> On Wed, 2009-03-04 at 03:22 +0800, Rafael J. Wysocki wrote:
> > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12758
> > Subject : ACPI exception with 2.6.29-rc6
> > Submitter : Heinz Diehl <email@example.com>
> > Date : 2009-02-23 16:46 (9 days old)
> > References : http://marc.info/?l=linux-kernel&m=123540758700861&w=4
> Handled by: Len Brown <firstname.lastname@example.org>
Handled-By : Len Brown <email@example.com>
Patch : http://bugzilla.kernel.org/attachment.cgi?id=20368&action=view
shipped upstream on top of 2.6.29-rc8-git2