ACPI / init: Make it possible to override _REV

[cascardo/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 61ab162..1801024 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -274,6 +274,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        acpi_os_name=   [HW,ACPI] Tell ACPI BIOS the name of the OS
                        Format: To spoof as Windows 98: ="Microsoft Windows"
 
+       acpi_rev_override [ACPI] Override the _REV object to return 5 (instead
+                       of 2 which is mandated by ACPI 6) as the supported ACPI
+                       specification revision (when using this switch, it may
+                       be necessary to carry out a cold reboot _twice_ in a
+                       row to make it take effect on the platform firmware).
+
        acpi_osi=       [HW,ACPI] Modify list of supported OS interface strings
                        acpi_osi="string1"      # add string1
                        acpi_osi="!string2"     # remove string2