Comment 29 for bug 1143312

Finally upstream has a patch! This shall be included in kernel 3.11. It may be a good idea to SRU it after a while when nobody in upstream complains about it.

commit 2fa97feb4406c546b52e35b6b6c50cb8f63425d2
Author: Lan Tianyu <email address hidden>
Date: Wed Jun 5 02:27:50 2013 +0000

    ACPI: Add CMOS RTC Operation Region handler support

    On HP Folio 13-2000, the BIOS defines a CMOS RTC Operation Region and
    the EC's _REG methord accesses that region. Thus an appropriate
    address space handler must be registered for that region before the
    EC driver is loaded.

    Introduce a mechanism for adding CMOS RTC address space handlers.
    Register an ACPI scan handler for CMOS RTC devices such that, when
    a device of that kind is detected during an ACPI namespace scan, a
    common CMOS RTC operation region address space handler will be
    installed for it.

    References: https://bugzilla.kernel.org/show_bug.cgi?id=54621
    Reported-and-tested-by: Stefan Nagy <email address hidden>
    Signed-off-by: Lan Tianyu <email address hidden>
    Cc: 3.9+ <email address hidden>
    Signed-off-by: Rafael J. Wysocki <email address hidden>