https://bugzilla.kernel.org/show_bug.cgi?id=26342

               URL: http://bugs.gentoo.org/show_bug.cgi?id=332899
           Summary: Upgrading from 2.6.28 results in i801_i2c conflicting
                    with acpi and no i2c on the system
           Product: ACPI
           Version: 2.5
    Kernel Version: 2.6.32 and newer
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: EC
        AssignedTo: acpi...@kernel-bugs.osdl.org
        ReportedBy: franxisco1988+ker...@gmail.com
        Regression: Yes


After upgrading from 2.6.28 to 2.6.32 i801_i2c stoped working.

The relevant dmesg part when trying to modprobe is this:
[ 4867.708950] ACPI: resource 0000:00:1f.3 [io  0xe800-0xe80f] conflicts with
ACPI region SM00 [??? 0x0000e800-0x0000e806 flags 0x30]
[ 4867.708963] ACPI: If an ACPI driver is available for this device, you should
use it instead of the native driver

Looking at the docs I was suggested to go for the i2c_ec driver provided by
ACPI but it was removed in this commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=84cb55987236ffea062a35fbe1441768b6bb2722

I can try to compile the old i2c_ec code as a module and report back if
necessary.

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