http://bugzilla.kernel.org/show_bug.cgi?id=12376
------- Comment #39 from yakui.z...@intel.com 2009-03-18 18:34 -------
After the boot option of acpi_enforce_resources=strict is added, the i2c-i801
driver won't be loaded for the smbus PCI device again when the conflict is
detected. The following only complains that the i801_smbus driver can't be
loaded. It is what we expected.
>[ 0.881441] i801_smbus: probe of 0000:00:1f.3 failed with error -16
In fact this issue also exists on other vendor's motherboards.(For example: on
one box based on nvidia chipset).
This issue is mainly caused by the BIOS. The PCI SMbus device is accessed
by AML code. For example: Read the thermal temperature. In such case the PCI
smbus had better be hidden and can't be enumerated by PCI scanning. As there is
no synchronization between AML code and driver, there will exist the potential
issue if the driver is loaded for the PCI SMbus device.
So the better solution is to hide the SMbus PCI device. But how to hide it
depends on the chipset. Another reasonable solution is that the i2c_smbus
driver won't be loaded for smbus device when the conflict is detected.
Thanks.
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