Bug 15361

Summary:	nForce2_smbus conflicts with ACPI region SM00
Product:	ACPI	Reporter:	argos66
Component:	Config-Other	Assignee:	ykzhao (yakui.zhao)
Status:	CLOSED DOCUMENTED
Severity:	low	CC:	lenb, rui.zhang, yakui.zhao
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.32	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg

Description argos66 2010-02-20 09:11:35 UTC

Hi,

I have this couple of line in my dmesg (more complete dmesg are in attachment).

[   11.171119] i2c i2c-0: nForce2 SMBus adapter at 0x1c00
[   11.171124] ACPI: I/O resource nForce2_smbus [0x1c40-0x1c7f] conflicts with ACPI region SM00 [0x1c40-0x1c45]
[   11.171191] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   11.171193] nForce2_smbus 0000:00:01.1: Error probing SMB2.

#uname -a
Linux argos-lnx 2.6.32-13-generic #18-Ubuntu SMP Wed Feb 10 21:32:38 UTC 2010 x86_64 GNU/Linux

#dmidecode --type baseboard
# dmidecode 2.9
SMBIOS 2.4 present.

Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
	Manufacturer: ASUSTeK Computer INC.
	Product Name: M2N-SLI DELUXE
	Version: 1.XX
	Serial Number: 123456789000


Many people have the same bug on differents motherboard (look at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/440780)

Thanks,

Comment 1 argos66 2010-02-20 09:20:58 UTC

Created attachment 25129 [details]
dmesg

Comment 2 ykzhao 2010-02-22 01:06:19 UTC

Hi,
   The corresponding I/O port(0x1C40-0x1c45) will be accessed by ACPI. If we still load the nforce2_smbus driver, they will access the same I/O port. As there is no synchronization between smbus driver and ACPI, maybe the system can't work well. So when the resource conflict is detected, we had better not load the corresponding nforce2_smbus driver.

    If you think that nforce2_smbus driver is very important, you can add the boot option of "acpi_enforce_resources=lax". Of course the warning message still exists. But it can be loaded.

Thanks.

Comment 3 ykzhao 2010-02-22 01:11:34 UTC

The warning message does the right thing. It only reminds that the nforce2_smbus driver had better not be loaded as there exists the potential conflict between ACPI and SMbus driver.

thanks.

Comment 4 Zhang Rui 2010-02-22 05:50:18 UTC

is there anything bad together with this message?
for example, are there any devices that fail to work in 2,6,32, compared with 2.6.30/31?

Comment 5 argos66 2010-02-22 07:19:58 UTC

Thanks for your responses.

This problem exists in 2.6.30 and 2.6.31.
This message don't block the system or other, but it's for have a cleanup boot log.

Thanks.