[Bugme-new] [Bug 13620] New: acpi_enforce_resources broken - conflicting i2c module loaded on some EeePCs

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Thu Jun 25 01:31:41 PDT 2009


http://bugzilla.kernel.org/show_bug.cgi?id=13620

           Summary: acpi_enforce_resources broken - conflicting i2c module
                    loaded on some EeePCs
           Product: ACPI
           Version: 2.5
    Kernel Version: Debian 2.6.30-1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Config-Other
        AssignedTo: acpi_config-other at kernel-bugs.osdl.org
        ReportedBy: alan-jenkins at tuffmail.co.uk
        Regression: Yes


Created an attachment (id=22090)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22090)
2.6.30 dmesg: i2c_i801 loads, causes 15 second delay in eeepc-laptop

This was raised when eeepc-laptop was reported to cause ~15 second delays on
bootup.  We saw it before in Bug 12376.  The cause is that i2c_i801 binds to
hardware which is also driven by the ACPI BIOS.  Blacklisting i2c_i801 fixes
it.

In debian 2.6.29-something, "acpi_enforce_resources=strict" fixes the problem
by reserving the resources used by ACPI, so i2c_i801 can't bind.

2.6.30 should fix it because "strict" is now the default.  But it doesn't work;
i2c_i801 is loaded even if the "strict" boot option is set.  This is a
regression.

References:
<http://lists.alioth.debian.org/pipermail/debian-eeepc-devel/2009-June/002316.html>

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