linux-kernel - Re: ACPI Error under 2.6.26-rc*

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Date:	Tue, 22 Jul 2008 10:01:12 +0200
From:	Andre Prendel <andre_prendel@....de>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Andre Prendel <andre_prendel@....de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	kernel-testers@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Zhao, Yakui" <yakui.zhao@...el.com>
Subject: Re: ACPI Error under 2.6.26-rc*

On Tue, Jul 22, 2008 at 10:22:39AM +0800, Zhang Rui wrote:
> On Thu, 2008-07-17 at 16:41 +0800, Andre Prendel wrote:
> > On Tue, Jul 15, 2008 at 04:41:00PM +0800, Zhang Rui wrote:
> > > > > It seems that OS failed to get the correct RSDT address
> > > > (0x1fff0000),
> > > > > although the RSDP is found correctly. (ACPI: RSDP 000FA340,
> > 0014)
> > > > >
> > > > > please run "./acpidump --addr 0xFA340 --length 0x14 > rsdp_xxx",
> > > > > and attach the rsdp for all of the three cases (good, ACPI
> > Error,
> > > > ACPI
> > > > > Exception).
> > > > Hello Rui,
> > > >
> > > > here is the output of the three cases. The dump files are attached
> > > > too.
> > > >
> > > > ----
> > > > good
> > > > ----
> > > > andre@...ntu:~/src/acpi/pmtools-20071116/acpidump$ hexdump
> > rsdp_good
> > > > 0000000 5352 2044 5450 2052 418c 494d 2020 0020
> > > > 0000010 0000 1fff                            
> > > > 0000014
> > > >
> > > > -----
> > > > error
> > > > -----
> > > > andre@...ntu:~/src/acpi/pmtools-20071116/acpidump$ hexdump
> > rsdp_error
> > > > 0000000 5352 2044 5450 2052 418a 494d 2020 0020
> > > > 0000010 0000 21ff                            
> > > > 0000014
> > > >
> > > > ---------
> > > > exception
> > > > ---------
> > > > andre@...ntu:~/src/acpi/pmtools-20071116/acpidump$ hexdump
> > > > rsdp_exception
> > > > 0000000 5352 2044 5450 2052 417c 494d 2020 0020
> > > > 0000010 0000 2fff                            
> > > > 0000014
> > >
> > > Weird.
> > > The dmesg shows that the memory map gotten from e820 table is
> > changed.
> > > And the file attached shows that rsdp points to different rsdt
> > address.
> > > >
> > > > Now I see the ACPI Error under the 2.6.25.10 kernel sometimes too,
> > but
> > > > power off works well. So I also attach the two configs. Maybe the
> > > > different config is the reason why power off works under
> > 2.6.25.10.
> > > so you may get different e820 table when running 2.6.25.10 as well?
> > > could you please attach the dmesg output of a 2.6.25.10 kernel which
> > has
> > > the ACPI error?
> > 
> > Attached. Yes, the e820 table differs, but power off still works.
> 
> Hmm, there seems to be two bugs here.
> 1. invalid e820 tables, which seems like a BIOS bug, please try to
> upgrade your BIOS.
> 2. poweroff doesn't work.
>    Hmm, please try boot option "acpi=off" in both 2.6.25 and 2.6.26.
>    I guess power off works on 2.6.25 while it fails on 2.6.26, right?

Hello Rui,

I have found the power off problem. After bisecting the problem without
success I compared the configs from 2.6.25.10 and 2.6.26-rc*. I have
seen a difference in the APM section. In the 2.6.26-rc* config
CONFIG_APM_DO_ENABLE was not enabled. I dont know how this could happen. AFAIR
I used the working 2.6.25 config and made just a "make oldconfig". So I have
enabled CONFIG_APM_DO_ENABLE, build the kernel and now power off works
fine. Further the ACPI errors/exceptions do not appear with 2.6.26 (stable)
and the new config. Maybe this is why CONFIG_APM_DO_ENABLE is enabled. I dont
know the relation between this option and ACPI.

-----------------------
dmesg (extract)
-----------------------
Linux version 2.6.26-default (andre@...ntu) (gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)) #13 Mon Jul 21 22:48:01 CEST 2008
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000001fff0000 (usable)
 BIOS-e820: 000000002fff0000 - 000000002fff8000 (ACPI data)
 BIOS-e820: 000000002fff8000 - 0000000030000000 (ACPI NVS)
 BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
 BIOS-e820: 00000000ffee0000 - 00000000fff00000 (reserved)
 BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved)
[...]
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
[...]

The bios problem still exists so maybe I will do an upgrade.
 
> thanks,
> rui

Thanks,
Andre
> 
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