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    SubjectRe: [PATCH -mm 7/8] ACPI hibernation: Utilize hardware signature

    > Subject: ACPI hibernation: Utilize hardware signature
    > ACPI defines a hardware signature. BIOS calculates the signature
    > according to hardware configure and if hardware changes while
    > hibernated, the signature will change. In that case, S4 resume
    > should fail.
    > Still, there may be systems on which this mechanism does not work
    > correctly, so it is better to provide a workaround for them. For
    > this reason, add a new switch to the acpi_sleep= command line
    > argument allowing one to disable hardware signature checking.
    > Signed-off-by: Shaohua Li <>
    > Signed-off-by: Rafael J. Wysocki <>


    (cesky, pictures)

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